The Titan II GLV (Gemini Launch Vehicle) or Gemini-Titan II was an American expendable launch system derived from the Titan II missile, which was used to launch twelve Gemini missions for NASA between 1964 and 1966. Two unmanned launches followed by ten manned ones were conducted from Launch Complex 19 at the Cape Canaveral Air Force Station, starting with Gemini 1 on April 8, 1964.WIKI
Gemini 8 was the sixth crewed mission of the NASA's Project Gemini. The mission was commanded by Command Pilot Neil A. Armstrong and Pilot David R. Scott. Gemini 8 conducted the first docking of two spacecraft in orbit, but suffered the first critical in-space system failure of a U.S. spacecraft which threatened the lives of the astronauts and required immediate abort of the mission. The mission began on March 16, 1966, 16:41:02 UTC and ended on March 17, 1966, 03:22:28 UTC.
NET: March 16th 1966 - 16:41 UTC
Instantaneous launch window.