"[3] The M-33 was deployed overseas and as part of the CONUS "manual air defense system"[6] for which Army Air Defense Command Posts telephoned foe aircraft information to the M-33 units which used its surveillance board to mark targets using grease pencil.
[3] In 1944, the US Army contracted[7] for an electronic "computer with guns, a tracking radar, plotting boards and communications equipment" (M33C & M33D models used different subassemblies for 90 & 120 mm gun/ammunition ballistics.
[9] Aberdeen Proving Ground[11] and Fort Bliss were training posts for M-33 personnel, and by 1957 there were 3 Ordnance Detachments in Germany for M33 Integrated Fire Control Repair—150th (Wiesbaden), 151st (Mannheim), & 152nd (Kaiserslautern) Ord Det (IFCR);[12] and functional test sites included the White Sands Proving Ground ranges (e.g., "Hueco Range No.
[14] The M-33 was later "utilized as a basic building block" by Strategic Air Command for the early 1960s Reeves AN/MSQ-35 Bomb Scoring Central[15] (the M33 tracking console was used for the Vietnam War's AN/MSQ-77, AN/TSQ-81, & AN/TSQ-96 Bomb Directing Centrals).
M-33s were later used for geological/meteorological research (1966 San Clemente Island,[16] 1978 Winston Field,[17] Penn State, Univ of Wyoming, & 1963 Austin.