The Titan II/Gemini launch vehicle was dismantled to protect it from two hurricanes in August and September 1964. The second stage of the vehicle was taken down and stored in a hangar on August 26, 1964 in preparation for Hurricane Cleo, and the entire launch vehicle was subsequently dismantled and removed from Cape Kennedy Air Force Station's Launch Complex 19 in early September before Hurricane Dora passed over Cape Kennedy on September 9. The Gemini launch vehicle was erected for the final time on 12 September 1964. , John Young, Wally Schirra, Thomas P. Stafford, and Gus Grissom, practice egress from the Gemini 2 pad, in preparation for the upcoming Gemini 3 flight Many ground tests were carried out on the Gemini 2 and Titan rocket in November 1964. On November 24, Gemini-Titan 2 successfully completed the Wet Mock Simulated Launch, a full-scale countdown exercise which included propellant loading. Procedures for flight crew suiting and spacecraft ingress and egress were practiced during simulated launch. The prime flight crew for Gemini 3 donned pressure suits and full biomedical instrumentation, assisted by their backup crew and the space suit bioinstrumentation and aeromedical personnel who would participate in the GT-3 launch operation. As a result of this practice operation, it was established that all physical examinations, bioinstrumentation sensor attachment, and suit donning would be done in the pilot ready room at Launch Complex 16. Gemini 2 had been scheduled for launch on December 9, 1964. On that date, the countdown reached zero and the first stage engines were ignited. The launch vehicle's Malfunction Detection System detected technical problems due to a loss of hydraulic pressure and shut down the engines about one second after ignition. On the second launch attempt on January 19, 1965, Gemini 2 lifted off from Launch Complex 19 at Cape Kennedy at 9:03:59 a.m. EST. Shortly after launch the Mission Control Center suffered a power outage. Control of the mission was transferred to a tracking ship. The outage was later traced to an overload of the electrical system from the network television equipment used to cover the launch. Gemini 2 flew a ballistic suborbital arc over the Atlantic Ocean reaching a maximum altitude of. The spacecraft was run by an onboard automatic sequencer. At 6 minutes 54 seconds after launch, retrorockets were fired. The spacecraft landed downrange from the launch pad. The flight lasted 18 minutes 16 seconds. The landing was short of the planned impact point, and from the recovery aircraft carrier,. The spacecraft was brought aboard the carrier at 15:52 UT. Most goals were achieved, except the fuel cells had failed before liftoff and were turned off. The spacecraft cooling system temperature also was found to be too high. The Gemini 2 spacecraft was in excellent condition. Its heat shield and retrorockets functioned as expected. The Gemini 2 mission was supported by 6,562 United States Department of Defense personnel, 67 aircraft, and 16 ships. Gemini 2 had flight instrumentation pallets installed in the crew cabin, similar to those in Gemini 1.
