What is the abbreviation for undersea warfare?

The abbreviation for undersea warfare is USW. This term specifically refers to military operations conducted in the underwater environment, primarily aimed at defeating threats and ensuring the safety of naval operations. The “U” stands for "undersea," while “SW” denotes "submarine warfare," which accurately reflects the focus on naval engagements below the ocean's surface.

Recognizing this terminology is important within military contexts, especially in discussions related to naval strategy and tactics. The other choices do not correctly convey the full meaning of undersea warfare. For example, "UW" could imply underwater but does not specify warfare, "USC" generally refers to a United States Code or university in different contexts, and "UWL" is not a recognized acronym related to this field. Therefore, USW is the proper abbreviation reflecting the concept of undersea warfare comprehensively.