Enemy targets were disappointingly few for a new submarine, for the Navy had almost completely swept the sea of Japanese shipping by this time.

On 30 June, she joined Baya (SS-318) in a concerted gun attack on five small enemy craft, one (Bandai Maru) which she sank after its crew had abandoned it.

Refitted at Fremantle submarine base, Western Australia, Capitaine sailed for her second war patrol, arriving in her assigned area just three days before hostilities ended.

She returned to the west coast in September 1945, but in January 1946 was bound for the Far East once more, training in Philippine waters through March.

A month of operations at Pearl Harbor preceded her return to San Diego, from which, after an overhaul, she made two simulated war patrols in 1947 and 1948, and conducted local training and services.