1 00:00:07,349 --> 00:00:06,309 i believe that this nation should commit 2 00:00:09,350 --> 00:00:07,359 itself 3 00:00:11,509 --> 00:00:09,360 to achieving the goal 4 00:00:13,350 --> 00:00:11,519 before this decade is out 5 00:00:16,470 --> 00:00:13,360 of landing a man on the moon and 6 00:00:18,950 --> 00:00:16,480 returning him safely to the earth we 7 00:00:21,590 --> 00:00:18,960 choose to go to the moon in this decade 8 00:00:24,550 --> 00:00:21,600 and do the other things not because they 9 00:00:26,550 --> 00:00:24,560 are easy but because they are hard 10 00:00:28,870 --> 00:00:26,560 because that goal 11 00:00:32,069 --> 00:00:28,880 will serve to organize and measure the 12 00:00:36,389 --> 00:00:32,079 best of our energies and skills 13 00:00:38,630 --> 00:00:36,399 the date was may 25th 1961. 14 00:00:40,389 --> 00:00:38,640 thrust into a race for international 15 00:00:42,549 --> 00:00:40,399 space supremacy 16 00:00:44,869 --> 00:00:42,559 president john f kennedy passed the 17 00:00:59,990 --> 00:00:44,879 torch to a young national aeronautics 18 00:01:04,869 --> 00:01:02,229 the complex sophisticated space shuttle 19 00:01:07,510 --> 00:01:04,879 of today with its ability to routinely 20 00:01:10,230 --> 00:01:07,520 carry six or more people into space 21 00:01:15,190 --> 00:01:10,240 began as a tiny capsule where even one 22 00:01:17,429 --> 00:01:15,200 person felt cramped the mercury program 23 00:01:19,109 --> 00:01:17,439 the seven flights of project mercury 24 00:01:20,469 --> 00:01:19,119 proved that humans could survive in 25 00:01:23,190 --> 00:01:20,479 space 26 00:01:24,630 --> 00:01:23,200 the next step was gemini expanding our 27 00:01:26,870 --> 00:01:24,640 reach 28 00:01:29,429 --> 00:01:26,880 the two unmanned and 10-man flights of 29 00:01:31,429 --> 00:01:29,439 project gemini subjected man and 30 00:01:33,590 --> 00:01:31,439 equipment to flights of up to two weeks 31 00:01:36,469 --> 00:01:33,600 in duration 32 00:02:20,229 --> 00:01:36,479 america thrilled to the first spacewalk 33 00:02:24,309 --> 00:02:22,229 the cumulative experience of these early 34 00:02:26,869 --> 00:02:24,319 man flights gave nasa a foundation of 35 00:02:29,110 --> 00:02:26,879 confidence for its next project 36 00:02:32,070 --> 00:02:29,120 apollo the national effort that 37 00:02:34,949 --> 00:02:32,080 fulfilled a dream as old as humanity a 38 00:02:37,430 --> 00:02:34,959 human on the moon 39 00:02:39,350 --> 00:02:37,440 from mercury to apollo the space program 40 00:02:42,229 --> 00:02:39,360 depended on the goddard space flight 41 00:02:43,990 --> 00:02:42,239 center for its link to earth 42 00:02:46,710 --> 00:02:44,000 for goddard was the home of the manned 43 00:02:49,670 --> 00:02:46,720 space flight network the central control 44 00:02:51,750 --> 00:02:49,680 for 29 ground tracking stations four 45 00:02:54,309 --> 00:02:51,760 tracking ships and eight specially 46 00:02:56,390 --> 00:02:54,319 modified tracking planes 47 00:02:58,309 --> 00:02:56,400 these were scattered around the world to 48 00:03:01,509 --> 00:02:58,319 keep in constant communication with the 49 00:03:03,509 --> 00:03:01,519 astronauts in their vehicle 50 00:03:05,430 --> 00:03:03,519 for a manned mission to the moon project 51 00:03:08,710 --> 00:03:05,440 apollo would need a monster rocket 52 00:03:11,270 --> 00:03:08,720 called saturn 5 53 00:03:13,270 --> 00:03:11,280 saturn 5 was just one item on nasa's 54 00:03:15,270 --> 00:03:13,280 long shopping list 55 00:03:17,110 --> 00:03:15,280 years of testing and designing went into 56 00:03:19,030 --> 00:03:17,120 preparing astronauts 57 00:03:21,190 --> 00:03:19,040 rockets and equipment for the first 58 00:03:23,350 --> 00:03:21,200 lunar landing 59 00:03:27,750 --> 00:03:23,360 cape canaveral soon to be named cape 60 00:03:31,030 --> 00:03:27,760 kennedy needed a building 525 feet tall 61 00:03:32,869 --> 00:03:31,040 where the saturn v the apollo spacecraft 62 00:03:35,350 --> 00:03:32,879 and the moon landing ship could be put 63 00:03:38,149 --> 00:03:35,360 together atop a track carrier as big as 64 00:03:40,149 --> 00:03:38,159 a baseball diamond 65 00:03:41,750 --> 00:03:40,159 before humans could land on the moon it 66 00:03:52,070 --> 00:03:41,760 was necessary to learn about the 67 00:03:56,309 --> 00:03:53,990 in those days we were not at all sure 68 00:03:58,789 --> 00:03:56,319 about what the space environment was and 69 00:03:59,670 --> 00:03:58,799 we were very concerned about 70 00:04:09,190 --> 00:03:59,680 the 71 00:04:10,949 --> 00:04:09,200 picture taking ranger spacecraft sent 72 00:04:12,949 --> 00:04:10,959 back thousands of lunar photographs 73 00:04:14,869 --> 00:04:12,959 before crash landing into the lunar 74 00:04:16,870 --> 00:04:14,879 surface 75 00:04:19,349 --> 00:04:16,880 as the time grew closer to the historic 76 00:04:22,390 --> 00:04:19,359 moon landing guided crews checked and 77 00:04:24,310 --> 00:04:22,400 rechecked every circuit every antenna 78 00:04:26,150 --> 00:04:24,320 every console to assure that nothing 79 00:04:28,150 --> 00:04:26,160 would go wrong during this landmark 80 00:04:29,990 --> 00:04:28,160 mission 81 00:04:31,830 --> 00:04:30,000 and we were we had the responsibility of 82 00:04:33,830 --> 00:04:31,840 testing these facilities 83 00:04:36,390 --> 00:04:33,840 from an operation standpoint utilizing 84 00:04:37,990 --> 00:04:36,400 the facilities of nascom 85 00:04:39,670 --> 00:04:38,000 and we 86 00:04:41,270 --> 00:04:39,680 we supported 24 hours a day for a 87 00:04:42,790 --> 00:04:41,280 monthly period of time 88 00:04:44,710 --> 00:04:42,800 during a program called we used to call 89 00:04:46,790 --> 00:04:44,720 it agnoff but it's apollo goss 90 00:04:49,110 --> 00:04:46,800 qualification navigation program 91 00:04:51,270 --> 00:04:49,120 where we used to track lunar orbiter 92 00:04:53,510 --> 00:04:51,280 with the 30 foot antennas parabolic 93 00:04:55,189 --> 00:04:53,520 antennas which we called usb antennas 94 00:04:56,870 --> 00:04:55,199 that were located at the demand space 95 00:04:59,110 --> 00:04:56,880 flight stations around the world 96 00:05:00,710 --> 00:04:59,120 as far as preparation for the mission 97 00:05:01,990 --> 00:05:00,720 and troubleshooting circuits when they 98 00:05:03,749 --> 00:05:02,000 would fail 99 00:05:05,990 --> 00:05:03,759 i like to think of it and i used to call 100 00:05:08,390 --> 00:05:06,000 it then the great db witch hunt because 101 00:05:11,029 --> 00:05:08,400 we had made promises to the network that 102 00:05:12,710 --> 00:05:11,039 we could exchange test tones between our 103 00:05:14,629 --> 00:05:12,720 center and the remote tracking stations 104 00:05:16,870 --> 00:05:14,639 and get those test tones back plus or 105 00:05:18,310 --> 00:05:16,880 minus three db which is a pretty 106 00:05:19,670 --> 00:05:18,320 stringent requirement for the 107 00:05:22,790 --> 00:05:19,680 air-to-ground 108 00:05:24,550 --> 00:05:22,800 astronaut voice relay circuits 109 00:05:26,950 --> 00:05:24,560 the man destined to put the first 110 00:05:28,469 --> 00:05:26,960 footprint on the moon was commander neil 111 00:05:30,710 --> 00:05:28,479 a armstrong 112 00:05:32,629 --> 00:05:30,720 a former nasa test pilot who had 113 00:05:35,029 --> 00:05:32,639 experience in space during project 114 00:05:38,310 --> 00:05:35,039 gemini 115 00:05:40,390 --> 00:05:38,320 edwin e aldrin jr known as buzz who 116 00:05:41,990 --> 00:05:40,400 would be the second man on the moon had 117 00:05:44,310 --> 00:05:42,000 a doctor of science degree in 118 00:05:46,150 --> 00:05:44,320 astronautics 119 00:05:48,550 --> 00:05:46,160 michael collins with a bachelor of 120 00:05:50,950 --> 00:05:48,560 science degree was to fly the apollo 121 00:05:52,790 --> 00:05:50,960 command ship in parking orbit around the 122 00:05:55,189 --> 00:05:52,800 moon while his fellow crewmen explored 123 00:06:18,870 --> 00:05:55,199 below 124 00:06:23,590 --> 00:06:21,510 armstrong went aboard at 6 54 a.m and 125 00:06:26,790 --> 00:06:23,600 took position in the apollo's left hand 126 00:06:39,189 --> 00:06:28,710 five minutes to lift off and still 127 00:06:45,830 --> 00:06:42,950 t-minus 15 seconds guidance is internal 128 00:06:46,790 --> 00:06:45,840 12 11 10 129 00:07:06,309 --> 00:06:46,800 9 130 00:07:11,430 --> 00:07:08,629 perhaps a million americans came to cape 131 00:07:15,029 --> 00:07:11,440 kennedy to see the astronauts off 132 00:07:17,350 --> 00:07:15,039 so did 3 000 newsmen from 56 countries 133 00:07:20,230 --> 00:07:17,360 half of the u.s congress and the vice 134 00:07:22,870 --> 00:07:20,240 president of the united states 135 00:07:25,270 --> 00:07:22,880 former president lyndon b johnson an 136 00:07:27,350 --> 00:07:25,280 avid space program supporter and mrs 137 00:07:29,589 --> 00:07:27,360 johnson were among those who followed 138 00:07:31,189 --> 00:07:29,599 the apollo 11 liftoff 139 00:07:36,230 --> 00:07:31,199 millions more watched the launch on 140 00:07:40,309 --> 00:07:38,390 immediately following launch 141 00:07:42,790 --> 00:07:40,319 the 30-foot antennas at goddard's 142 00:07:45,110 --> 00:07:42,800 merritt island tracking station picked 143 00:07:46,790 --> 00:07:45,120 up communications with the spacecraft 144 00:07:49,670 --> 00:07:46,800 then handed the circuits off to the 145 00:07:51,909 --> 00:07:49,680 ground station at grand bahama island 146 00:07:54,150 --> 00:07:51,919 then bermuda followed by the tracking 147 00:07:57,270 --> 00:07:54,160 ship vanguard in the atlantic ocean and 148 00:07:59,589 --> 00:07:57,280 so on around the world 149 00:08:01,510 --> 00:07:59,599 goddard was the control center for all 150 00:08:02,710 --> 00:08:01,520 the ground stations that were around the 151 00:08:03,909 --> 00:08:02,720 world that we're going to be supporting 152 00:08:05,350 --> 00:08:03,919 and that we're supporting the manna 153 00:08:07,110 --> 00:08:05,360 flight program 154 00:08:09,189 --> 00:08:07,120 nascom's the central hub of the nasa 155 00:08:10,309 --> 00:08:09,199 communications network and still is to 156 00:08:12,070 --> 00:08:10,319 this day 157 00:08:13,830 --> 00:08:12,080 which means all of the signals coming in 158 00:08:15,589 --> 00:08:13,840 from the remote tracking stations reach 159 00:08:17,990 --> 00:08:15,599 goddard before we hand them off to other 160 00:08:20,710 --> 00:08:18,000 facilities but during apollo everything 161 00:08:22,150 --> 00:08:20,720 came into goddard first so anything that 162 00:08:24,710 --> 00:08:22,160 was said 163 00:08:26,550 --> 00:08:24,720 as an example the the astronaut voices 164 00:08:28,390 --> 00:08:26,560 would be in a digital format from the 165 00:08:29,990 --> 00:08:28,400 spacecraft but when they reached the 166 00:08:32,389 --> 00:08:30,000 tracking stations they were put into an 167 00:08:34,070 --> 00:08:32,399 analog form and traveled that way into 168 00:08:36,709 --> 00:08:34,080 goddard where we conferenced all of the 169 00:08:39,670 --> 00:08:36,719 voice circuits together and then handed 170 00:08:41,269 --> 00:08:39,680 them off to jsc to houston 171 00:08:43,829 --> 00:08:41,279 views of their home from the apollo 172 00:08:46,790 --> 00:08:43,839 spacecraft reminded earthlings the world 173 00:08:48,949 --> 00:08:46,800 over of how fragile their planet is and 174 00:08:50,870 --> 00:08:48,959 of the need to preserve and protect its 175 00:08:53,110 --> 00:08:50,880 resources 176 00:08:55,350 --> 00:08:53,120 the pictures they saw and the video 177 00:08:57,509 --> 00:08:55,360 coverage we have today would look like 178 00:08:59,509 --> 00:08:57,519 nothing more than gobbledygook without 179 00:09:01,269 --> 00:08:59,519 the special camera and processing 180 00:09:03,750 --> 00:09:01,279 techniques developed by a team of 181 00:09:05,590 --> 00:09:03,760 goddard engineers 182 00:09:07,509 --> 00:09:05,600 not only did they have a couple modes of 183 00:09:09,750 --> 00:09:07,519 operation which were simply let's try 184 00:09:12,230 --> 00:09:09,760 this if this doesn't work but 185 00:09:13,430 --> 00:09:12,240 we also had a very limited bandwidth and 186 00:09:15,670 --> 00:09:13,440 we the grand equipment had to 187 00:09:18,389 --> 00:09:15,680 reconstruct the picture so that would be 188 00:09:20,630 --> 00:09:18,399 usable the picture as transmitted 189 00:09:22,630 --> 00:09:20,640 would not be able to be telecast on a 190 00:09:24,470 --> 00:09:22,640 home receiver 191 00:09:25,590 --> 00:09:24,480 as viewed it would be a very flickering 192 00:09:27,430 --> 00:09:25,600 picture that 193 00:09:31,110 --> 00:09:27,440 would not be too usable except for 194 00:09:32,870 --> 00:09:31,120 possibly an engineer evaluation 195 00:09:34,550 --> 00:09:32,880 when the camera on the lunar lander 196 00:09:36,630 --> 00:09:34,560 began to transmit pictures as it 197 00:09:38,310 --> 00:09:36,640 approached the moon the goddard team 198 00:09:40,550 --> 00:09:38,320 received the signal at a special 199 00:09:42,790 --> 00:09:40,560 processing facility set up in sydney 200 00:09:46,870 --> 00:09:42,800 australia 201 00:09:50,070 --> 00:09:46,880 people were just 202 00:09:51,829 --> 00:09:50,080 so excited and they actually set up 203 00:09:53,430 --> 00:09:51,839 television monitors in 204 00:09:56,230 --> 00:09:53,440 the uh i believe it was called peace 205 00:09:57,750 --> 00:09:56,240 cross the main square in sydney where 206 00:10:00,389 --> 00:09:57,760 thousands of people came out to to 207 00:10:01,670 --> 00:10:00,399 witness this 208 00:10:03,110 --> 00:10:01,680 contact light 209 00:10:04,870 --> 00:10:03,120 okay engine stop 210 00:10:06,550 --> 00:10:04,880 aca had a defense 211 00:10:09,670 --> 00:10:06,560 boat control both auto decent engine 212 00:10:13,350 --> 00:10:09,680 command override off engine arm off 13 213 00:10:15,190 --> 00:10:13,360 is in we copy it down eagle 214 00:10:17,430 --> 00:10:15,200 uh 215 00:10:18,710 --> 00:10:17,440 tranquility base here the eagle has 216 00:10:21,430 --> 00:10:18,720 landed 217 00:10:23,190 --> 00:10:21,440 the first word may have been houston but 218 00:10:25,990 --> 00:10:23,200 the first people to hear it were 219 00:10:30,630 --> 00:10:26,000 goddard's voice controllers 220 00:10:30,640 --> 00:10:43,990 it's 221 00:10:47,269 --> 00:10:45,910 the primary package was a seismic 222 00:10:49,910 --> 00:10:47,279 package the 223 00:10:50,870 --> 00:10:49,920 two of detailed moonquakes 224 00:10:53,190 --> 00:10:50,880 and a 225 00:10:54,870 --> 00:10:53,200 laser retro reflector package which is 226 00:10:59,030 --> 00:10:54,880 quite small 227 00:11:00,870 --> 00:10:59,040 but it had 64 cube reflectors in it 228 00:11:02,230 --> 00:11:00,880 so they could use their lasers from the 229 00:11:04,230 --> 00:11:02,240 earth and 230 00:11:06,230 --> 00:11:04,240 find to fine-tune the distance between 231 00:11:08,470 --> 00:11:06,240 the earth and the moon 232 00:11:09,910 --> 00:11:08,480 those small retroreflectors are still 233 00:11:11,910 --> 00:11:09,920 used today 234 00:11:14,630 --> 00:11:11,920 by bouncing lasers off these lunar base 235 00:11:15,990 --> 00:11:14,640 reflectors goddard scientists continue 236 00:11:17,829 --> 00:11:16,000 to learn about the movement of the 237 00:11:19,990 --> 00:11:17,839 earth's crustal plates with the same 238 00:11:22,470 --> 00:11:20,000 accuracy as when they were first placed 239 00:11:24,470 --> 00:11:22,480 on the moon 240 00:11:25,910 --> 00:11:24,480 not long after noon the next day the 241 00:11:28,069 --> 00:11:25,920 21st 242 00:11:29,910 --> 00:11:28,079 the astronauts fired the ascent engine 243 00:11:32,069 --> 00:11:29,920 and launched eagle on the first leg of 244 00:11:33,910 --> 00:11:32,079 what was to be a triumphant return to 245 00:11:37,350 --> 00:11:33,920 earth 246 00:11:42,069 --> 00:11:37,360 apollo 11 splashed down at 12 50 p.m 247 00:11:46,790 --> 00:11:42,079 eastern daylight time on july 24 1969 248 00:11:49,990 --> 00:11:46,800 about 900 miles southwest of hawaii 249 00:11:51,910 --> 00:11:50,000 two goddard satellites ats one and three 250 00:11:54,150 --> 00:11:51,920 were used to relay television coverage 251 00:11:57,670 --> 00:11:54,160 of the recovery operations to an anxious 252 00:11:59,430 --> 00:11:57,680 world the big thing that we did and i 253 00:12:01,509 --> 00:11:59,440 think well because it was spectacular 254 00:12:03,509 --> 00:12:01,519 because everybody saw it was the 255 00:12:06,069 --> 00:12:03,519 television through our microwave system 256 00:12:08,470 --> 00:12:06,079 on the ats spacecraft at one time we 257 00:12:10,389 --> 00:12:08,480 planted a little 258 00:12:12,790 --> 00:12:10,399 12 15 foot antenna 259 00:12:14,550 --> 00:12:12,800 on the flight deck of the carrier and 260 00:12:16,949 --> 00:12:14,560 actually transmitted 261 00:12:19,030 --> 00:12:16,959 to live television from the 262 00:12:20,790 --> 00:12:19,040 carrier from what was going on on the 263 00:12:22,470 --> 00:12:20,800 deck of the carrier 264 00:12:24,870 --> 00:12:22,480 via the ats satellite back to the 265 00:12:27,750 --> 00:12:24,880 networks it was the only possible live 266 00:12:29,110 --> 00:12:27,760 call live television to the whole world 267 00:12:30,870 --> 00:12:29,120 could see what was going on and of 268 00:12:34,069 --> 00:12:30,880 course included in that 269 00:12:35,750 --> 00:12:34,079 was the the actual recovery 270 00:12:36,790 --> 00:12:35,760 apollo did more than reach for the 271 00:12:38,629 --> 00:12:36,800 future 272 00:12:41,269 --> 00:12:38,639 it refreshed our spirits and heightened 273 00:12:43,509 --> 00:12:41,279 our awareness of the human potential 274 00:12:45,190 --> 00:12:43,519 for the united states apollo provided 275 00:12:47,590 --> 00:12:45,200 renewed confidence 276 00:12:49,670 --> 00:12:47,600 that given the resolve resources and 277 00:12:52,230 --> 00:12:49,680 commitment of a free people 278 00:12:57,750 --> 00:12:52,240 the u.s can lead mankind in the great 279 00:13:01,430 --> 00:13:00,230 we lived through an era 280 00:13:04,629 --> 00:13:01,440 and 281 00:13:06,470 --> 00:13:04,639 part of that era was the the time that 282 00:13:08,389 --> 00:13:06,480 john kennedy said 283 00:13:10,150 --> 00:13:08,399 i challenge this nation to put a man in 284 00:13:12,069 --> 00:13:10,160 orbit and return him safely within this 285 00:13:14,629 --> 00:13:12,079 decade 286 00:13:17,829 --> 00:13:14,639 uh pursuant to that i don't think any of 287 00:13:20,550 --> 00:13:17,839 us will ever forget that 288 00:13:22,629 --> 00:13:20,560 famous day in dallas 289 00:13:25,269 --> 00:13:22,639 and then to put the men on the moon and 290 00:13:27,509 --> 00:13:25,279 bring him back safely was quite 291 00:13:31,590 --> 00:13:27,519 a monument memorial and i think all of 292 00:13:35,910 --> 00:13:33,750 we were a pretty young organization i i 293 00:13:38,069 --> 00:13:35,920 think i was in my 20s and i think just 294 00:13:40,389 --> 00:13:38,079 about all of the uh 295 00:13:42,550 --> 00:13:40,399 the voice controllers and the contractor 296 00:13:44,629 --> 00:13:42,560 workforce were were people in their 20s 297 00:13:46,710 --> 00:13:44,639 and possibly early 30s 298 00:13:49,030 --> 00:13:46,720 and it was a just a very exciting time 299 00:13:50,629 --> 00:13:49,040 for us i mean we would put hours and 300 00:13:52,870 --> 00:13:50,639 hours and hours of work in and we were 301 00:13:54,310 --> 00:13:52,880 proud to do it because we did see our 302 00:13:56,150 --> 00:13:54,320 piece in the puzzle 303 00:13:58,310 --> 00:13:56,160 and what our what our own personal 304 00:14:00,550 --> 00:13:58,320 accomplishments and we felt quite proud 305 00:14:03,430 --> 00:14:00,560 that we were part of bringing that data 306 00:14:05,670 --> 00:14:03,440 back to them because 307 00:14:08,550 --> 00:14:05,680 there was a whole purpose to get science 308 00:14:10,150 --> 00:14:08,560 data and that's what we did 309 00:14:12,069 --> 00:14:10,160 i think the biggest satisfaction was 310 00:14:13,750 --> 00:14:12,079 that it enabled everybody in the world 311 00:14:16,710 --> 00:14:13,760 to see something 312 00:14:18,389 --> 00:14:16,720 that was a one-shot one-time affair 313 00:14:21,110 --> 00:14:18,399 which was the first step 314 00:14:21,990 --> 00:14:21,120 and that's basically what we worked on 315 00:14:23,910 --> 00:14:22,000 and 316 00:14:25,910 --> 00:14:23,920 as other speakers that i've heard speak 317 00:14:27,189 --> 00:14:25,920 said that we worked a lot of long hours 318 00:14:31,269 --> 00:14:27,199 and 319 00:14:33,189 --> 00:14:31,279 that worked on that program probably 320 00:14:37,189 --> 00:14:33,199 agrees that uh they didn't notice it it 321 00:14:39,189 --> 00:14:37,199 was uh just too exciting to uh to to be 322 00:14:41,990 --> 00:14:39,199 concerned about the hours you spent it 323 00:14:44,629 --> 00:14:42,000 was a unique project and 324 00:14:46,150 --> 00:14:44,639 we haven't been back in a long time and 325 00:14:48,230 --> 00:14:46,160 it is something that 326 00:14:50,310 --> 00:14:48,240 we were really proud to be a part of and 327 00:14:51,670 --> 00:14:50,320 every country we went to they were all 328 00:14:52,870 --> 00:14:51,680 proud to be participating well it was a 329 00:14:54,870 --> 00:14:52,880 great thing for 330 00:14:56,790 --> 00:14:54,880 for for the united states 331 00:14:58,629 --> 00:14:56,800 it was a great thing for nasa