Apollo Command Module Block II Audio Center Equipment (ACE) measuring approximately 4.75 x 10.5 x 6, labeled “C28-1A111.” The unit has four connectors, “J1” through “J4” on the top, with the latter two bearing auxiliary cables, with one featuring part number: “ME414-0467-1004, 6607E-Deutsch PAT. 17292-37-7SY-1.” One end bears scratched off ID numbers, the opposite end stamped, “Serial No. 0006, Assy. 514-0040-010,” and two sides affixed with label: “Engineering Test Unit, Not For Flight, Parts/Assemblies Removed, Must Be Marked As Above.” In fine condition, with end of one auxiliary cable cracked. The ACE enabled communications among astronauts, between astronauts and launch personnel, and post-landing recovery frogmen; via the external communications links (Unified S-Band and VHF) to JSC Houston and the Lunar Module, as well as routing of audio to the Data Storage Equipment (DSE) for recording of audio signals.
