1922 - Report on observations of experiments with short wave radio at Anacostia in the District of Columbia starts Navy development of radar.
1941 - Launch of first Liberty ship, SS Patrick Henry, in Baltimore.
1942 - Armed Guard on SS Stephen Hopkins engages German auxiliary cruiser Stier and supply ship Tannenfels. Stephen Hopkins and Stier both sink.
1944 - Special Air Task Force (STAG-1) commences operations with drones, controlled by TBM Avanger aircraft, against Japanese in Southwestern Pacific.
1950 - First Marine Division captures Seoul, South Korea.