The first radio recognition IFF system in the U.S. Model XAE (1937). The airborne equipment, developed at NRL, shown at the top. The shipboard equipment is shown below. When in the vicinity of friendly ships, the aircraft equipment transmitted a series of coded signals. Aboard the ship, the
Yagi antenna gun shaped equipment was pointed at the aircraft, to flash.
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{{Information |Description=The first radio recognition IFF system in the U.S. '''Model XAE''' (1937). The airborne equipment, developed at NRL, shown at the top. The shipboard equipment is shown below. When in the vicinity of friendly ships, the aircraft
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