Brostrom was delivered to the Maritime Commission in 1943 as Marine Eagle, a C4-type tank transport. During WWII she operated in shuttle service across the Atlantic and Pacific, and went into reserve after the war. From 1948 to 1950 she served the US Army as Private Leonard C. Brostrom, then transferred to the Navy. She was converted to a heavy-lift cargo ship in 1953-54, and operated in that role into the 1970's.

Brostrom is distinguished by her heavy-lift booms on her midships kingpost, with a lift capacity of 150 tons. She was a near-sister to Marine Fiddler (T-AK 267), but that ship had a single-level bridge superstructure and a single kingpost forward.

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