To "permit one man [tracking] operation instead of three", the M-33 tracking console was modified for the AN/MSQ-51's "Tracking Radar Operator", and the remainder of the 4 man ATCC operations crew was a "Surveillance Radar Operator" and 2 Drone Controllers with the primary in the Operations Trailer. The "Secondary Operator's Position [was] located outside the van", and a "telemetry directional helical receiving antenna…on top of a mast ten feet high [was] 100 feet from the operating van." ATCC maintenance was by 6 radar technicians, 4 AN/SRW-4D technicians, and 4 for HVAC, generators, and accessories. At the China Lake "Target Radar Site", Reeves Instrument Corporation representative was an AN/MSQ-51 civilian contractor until ~1968.