| 1926: | Navy brings relief aid to Miami, FL, after a severe hurricane. |
| 1936: | Squadron 40-T, based in the Mediterranean, established to protect U.S. interests and citizens around Iberian peninsula throughout the Spanish Civil War. |
| 1941: | U.S. Navy ships escort eastbound British trans-Atlantic convoy for first time (Convoy HX-150). Although the U.S. Navy ships joined HX-150, which left port escorted by British ships on 16th, on night of 17 September, the official escort duty began on 18th. |
| 1947: | National Security Act becomes effective |