USS Hyannis (YTB-817)

USS Hyannis (YTB-817) was a United States Navy Natick-class tugboat large district harbor tug named for Hyannis, Massachusetts.

Construction and commissioning
The contract for Hyannis was awarded 9 August 1971. She was laid down down on 12 July 1972 at Marinette, Wisconsin, by Marinette Marine and launched 15 March 1973.

Operational history
Stricken from the Navy List 21 August 1997, Hyannis was transferred to the United States Fish & Wildlife Service at Midway Island and renamed the Constant II. In 2006 she was sold and renamed the Sea-Link Pusher.