NASA Photo ID: 71-H-1739
Date taken: 11/04/71

Apollo 16 Commander John Young (right) and Lunar Module Pilot Charles Duke check out Lunar Roving Vehicle 2 (LRV-2) systems during a simulation of extravehicular activity in the Manned Spacecraft Operations building. During this simulation they activated electrical and mechanical systems to confirm operation within design specifications.

Source: Scan by JL Pickering