Built in 1942, by Levingston Shipyard of Orange, Texas (hull #220) as the BAT-6 for the United States Navy.
Her keel was laid down on March 30th, 1942. The tug was launched on June 5th, 1942 and delivered to the United States Navy. On August 28th, 1942 she was transferred to Great Britain under terms of the Lend Lease Act. Where she was commissioned into the Royal Navy as Rescue Tug HMRT Masterful (W-20).
On March 11th, 1946 she was returned to the United States Navy at Norfolk, Virginia. On November 13th, 1946 the tug was struck from the Naval Register.
In 1947, the tug was acquired by the Moran Towing Company of New York, New York. Where she was renamed as the Eugenia M. Moran.
In 1959, she was acquired by the Pacific Inland Navigation Company of Seattle, Washington. Where the tug was renamed as the Comanche.
On April 16th, 1973 the tug was sunk in Vietnam. Powered by a single, General Motors 12-278A, diesel-electric engine. She was a single screw tug, rated at 1,500 horsepower.
single Fairbanks Morse reduction gear.