It's the control box for the power in an MSQ-85B shelter. Quoting from an article I found,
"AN/MSQ-85B Mobile Audiovisual Information Collection and Dissemination System. Few of the AN/MSQ-85B still exist in their original configuration, and these are more museum pieces of 1970s technology than usable equipment. The AN/MSQ-85B includes an AQ-4A movie projector, AN/UIH-6 public address system, AP-9 slide projector, AN/USH two-track international standard tape recorder, BM-22A large projection screen and R-520A/UUR radio receiver. "
PS, I got one of them too. Mine had the Camp Victory customs form still in it, clearing the shelter to come back to Ft. Bragg.
__________________
Mike KK4AIF
M109A3 Shop Van (G4-3
M35A2 Cargo Truck (G4-39)
S-280 Commo Shelter (bunk house on M-36)
MKT-85 Kitchen Trailer (G4-T1)
M36A2 Cargo Truck (G4-40)
2nd M35A2 Cargo Truck (G4-41)
2nd M109A3 Shop Van (G4-42)
M105 Trailer (G4-T2)
MJQ-18 Trailer (10 KW Power Plant) (G4-T3)
MKT-85 Trailer as FST (G4-T4)
MJQ-16 Trailer as water trailer using IBC (G4-T5)
M105 Tan trailer (at poppop's, need to pick up)
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