Gemini 3 (GT-3), launched on March 23, 1965, was the first Gemini manned flight crewed by Virgil "Gus" Grissom and John Young. It was also the final manned flight controlled from Cape Canaveral. The mission's primary goal was to test the new, maneuverable Gemini spacecraft. Although Gemini 3 was the first U.S. 2-crew manned spaceflight, it was not the first in the world; the Soviet sent a 3-crew team into space on Voskhod 1 mission in late 1964.
Gemini 3 "Orbit Covers" cancelled on launch day at Cape Canaveral, signed by Gus Grissom and John Young.
Photo: Gemini 3 crew (front left to right) Gus Grissom & John Young, with back-up crew (rear left to right) Walter Schirra & Thomas Stafford.