dailyreckoning.com

vPYA4 TIL that there is a tradition in the U.S. Navy that no submarine is ever lost. Those that go to sea and do not return are considered to be “still on patrol.”
mxZ1x TIL, that according to US Naval tradition, submarines that have not been confirmed to be destroyed are still on patrol. Since WWII, there are 52 submarine patrols that have not reported in, returned to port, or confirmed to be destroyed
pjL4 TIL that no U.S Navy submarine is ever considered “lost” if it does not return, it is considered to be “still on patrol”