What does HU stand for?

Helicopter Utility Squadron (US Navy Aviation unit designation used in from 1948 to 1965)

This definition appears very rarely and is found in the following Acronym Finder categories:

Military and Government

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Samples in periodicals archive:

After leaving most of the helicopter development to the Coast Guard during WW II, the Navy established Experimental Squadron (VX) 3 on 1 July 1946 to serve as a training squadron for helicopter pilots, replacing it with Helicopter Utility Squadron (HU) 2 on 1 April 1948.

Whirlybirds over Korea