Originally, POMCUS sites were primarily simply guarded, fenced-in lots of pre-loaded, maintained vehicles and weapons systems ready to roll, although the precursor to POMCUS sites was a series of underground storage areas liberated from the Germans in Pirmasens and the outlying areas Husterhoeh Kaserne utilized to store combat-readied armor.
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During the late 1960s-1980s, the above-ground POMCUS facilities were updated into large aluminum-over-steel warehouses, which provided the benefits of less weathering and lower maintenance requirements for the systems stored in them, as well as providing first-line defense against EMP radiation which could affect the electronics in both the communications systems and the recently implemented solid-state ignition systems on some vehicles.