Earphones for military tactical radio.
Provides good noise isolation. Its shape enables wearing a helmet over the earphones.
Used by US military from the early 1970s until late 1980s; designated H-251/U.
Earphones for military tactical radio.
Provides good noise isolation. Its shape enables wearing a helmet over the earphones.
Used by US military from the early 1970s until late 1980s; designated H-251/U.