One is a pin back and one is a screw back. The lapel pins are a little different from each other. Using the reference guide (see References), search the terms Navy or Air Force, for example. These words will distinguish one service's pin from another.
Many pins will have the words, 'United States of America, Department of the Army' or something similar. LOT PILOTS WINGS WW2 KOREA VIETNAM ARMY AIRFORCE MISSILE AIRCREW HELICOPTER NAVY.
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