The “Plugs Out” test scheduled for Jan 27, 1967 was not the first time that spacecraft 12 had been put through a simulated run with people on board…
“On my honor I will do my best, To do my duty to God and my country and to obey the Scout Law; To help other people at all times; To keep myself physically strong, mentally awake, and morally straight.” The Boy Scout Oath.
“So the reason I took those symbols was that I think this was the most important thing I had going for me, and I felt that while I couldn’t take one for every religion in the country, I could take the three I was most familiar with.” Ed. White
Mercury-Redstone 4 was the fourth mission in the Mercury-Redstone series and the second U.S. manned suborbital spaceflight. The mission was essentially a repeat of Alan Shepard’s Freedom 7 flight. So why was it necessary to launch another sub-orbital mission? Why not proceed with an orbital flight to match the Soviet Vostok 1? Among other things the U.S. needed more space experience to corroborate the “Man-in-Space” concept. Also the Redstone was the only booster NASA had that was approved for manned launches. The Atlas booster was available but not ready. Atlas was capable of putting a Mercury Capsule into orbit, but it had been launched three times with unmanned capsules, and it had exploded on 2 of the 3 attempts.