MLEM 12 Spacecraft: (no serial number) Launch Vehicle: Atlas D/Centaur Scheduled Launch: 15 Jul 1965 Last Scheduled: 30 Aug 1961	⇑ Mission List ⇑ Designation: Gemini AC L BD(U)-3 Description: 3rd Gemini Titan II/Centaur unmanned lunar lander docking target for manned Gemini

Mercury MK II 12 Spacecraft: Launch Vehicle: Titan II Scheduled Launch: 15 Ju1 1965 Last Scheduled: 30 Aug 1961 Prime Crew	⇑ Mission List ⇑ Designation: Gemini T2 L D-CTV-3 Description: 3rd Gemini Titan II manned docking to Gemini lunar lander
	not assigned not assigned Backup Crew not assigned not assigned

A year before the lunar orbit rendezvous (LOR) mode was selected for the Apollo goal of landing men on the Moon, James A. Chamberlin, chief of the Engineering Division at the Space Task Group at NASA/Langley, proposed using LOR to land a Gemini-based mission on the Moon. One pilot would remain in lunar orbit while the other pilot descended to the lunar surface in an ultra-light vehicle. Rendezvous and docking of the Gemini and its lunar landing vehicle would first be demonstrated during two missions in Earth orbit. In each case, the two vehicles would be launched separately, with the lunar landing vehicle being lofted into orbit by an Atlas Centaur while the Gemini rode into orbit on a Titan II. References: Grimwood, James M., and Hacker, Barton C., with Vorzimmer, Peter J. Project Gemini Technology and Operations: A Chronology (1969), NASA SP-4002. Hacker, Barton C., and Grimwood, James M. On Shoulders of Titans: A History of Project Gemini. (1977 hardbound and soft bound; reprinted softbound in January 2002), NASA SP-4203, Ch 3. Encyclopedia Astronautica. Wikipedia.