Few Good Men, A - Markinson Suicide Gun - Wrong Calibre.
Lt. Col. Markinson (J T Walsh) commits suicide with a US Marines standard issue Beretta 9mm pistol, albeit chromed, a concession to his rank.
In court later, Lt Kaffee (Tom Cruise aka Tom Mopather) describes the calibre as ".45" - monster mistake. US defence forces have not used .45 calibre weapons as standard issue for years.