The USS Moctobi (ATF-105), now called "Lion", and USS Quapaw (ATF-110), now called "Tiger", are US Navy salvage ship aka Fleet ocean tugs (ATF).
An ATF's duties is to provide towing, salvage and at times rescue operations for the fleet. Those are basically tow boats for disabled navy ships.
Those two tugs are decommissioned and are now docked at the Richmond Kaiser Naval Shipyard (near San Francisco), awaiting either refit or scrapping.
For more information about the Richmond Kaiser Naval Shipyard and the Rosie the Riveter World War II Home Front Memorial Park, check the album description.