The SCR-508 series radio represented the Army's commitment to both FM and crystal tuning, and was used extensively by armor and mechanized units.

The turret bustle of late series light and medium tanks was designed around this radio.

[1][2] The SCR-508 series was standardized on 22 July 1941, and used by armored forces for command and control of tank units.

It provided voice communications between tanks and other vehicles/units equipped with FM radios (such as the SCR-510 and others) operating in the same frequency range.

The Artillery branch used the same radios mirroring the SCR-508 series but with a different frequency range