Lunar Module 12 (LM-12)/Challenger ascent stage cabin 'baseline' documentation photo. Taken at the Manned Spacecraft Operations Building (MSOB), 13 March 1972.
In this view, looking up from Cernan's position, the docking window (its reticle markings visible/legible), and adjacent Crewman Optical Alignment Sight (COAS) mounting bracket can be seen. The Alignment Optical Telescope (AOT) guard, it's optics and controls plastic-covered, is to the upper right. Main panel/cabin floodlights are immediately to the lower left of the AOT assembly (with its controls to the upper left - I believe). The corner of the frame of the forward window, along with the end of the crash bar are visible at the lower right. Circuit breaker panel no. 11 is at the bottom.
