The first USS Canon (PGM-90/PG-90) was a Asheville-class gunboat in the United States Navy during the Vietnam War.

Canon served off the coast of Vietnam as part of Operation Market Time.

In one operation the ship took 8 rocket hits and 14 crew members wounded.

Canon had been identified as a candidate for preservation as a veteran's museum in Sheboygan, Wisconsin and was placed on donation hold in 2002.

The donation hold was removed on 30 August 2012[3] and her status updated to pending dismantling by the 2015 US Navy 30 year Shipbuilding Plan.