315th Signal Battalion (Microwave & Radio Relay) (Source: Bob Voss, 1954-55) The Mobile Radio Relay Terminal team at Site X, the fixed Alternate Command Post for 7th Army. Col. Rose was the CO of the 4th Sig Gp; Colvin was S-3; and OIC for the crew in the picture was Lt. Alexander P. Sidon (later Major or LTC) who reported to Colvin.