| 1922: | Report on observations of experiments with short wave radio at Anacostia, DC, starts Navy development of radar |
| 1941: | Launch of first Liberty ship, SS Patrick Henry, in Baltimore, MD |
| 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 aircraft, against Japanese in Southwestern Pacific |
| 1950: | First Marine Division captures Seoul, South Korea |