Over-the-beach capability

Over-the-beach (OTB) capability is the ability of a military or paramilitary force to launch an effective offensive against a defended coast, or the ability of a firearm to be safely fired immediately after being completely submerged in and taken out of water. The former consists of the number of soldiers, tanks, vehicles, and helicopters that a nation can stage over an adversary's defended coast in a time of war.

Source: Wikipedia — Over-the-beach capability (CC BY-SA 4.0)