Submarine oiler thumb|right|Guavina (AGSS-362), refueling a P5M Marlin flying boat in 1955 was converted under SCB 39 to a SSO in 1950 to carry fuel oil, gasoline, and cargo to amphibious beachheads. She received additional "saddle" tanks wrapped around her outer hull to carry these fuels and a streamlined sail. After a few tests, the concept was dropped in 1951 as impractical, and Guavina served in the test role for a few years under the designation AGSS. In 1957, she converted back to the oiler/tanker role and carried the designation AOSS. This time, she experimented with refueling seaplanes at sea, which was potentially important, as refueling the nuclear-capable Martin P6M Seamaster at sea could improve the Navy's strategic strike capabilities. However, this mission, too, was dropped and Guavina was decommissioned.
Submarine oiler thumb|right|Guavina (AGSS-362), refueling a P5M Marlin flying boat in 1955 was converted under SCB 39 to a SSO in 1950 to carry fuel oil, gasoline, and cargo to amphibious beachheads She received additional "saddle" tanks wrapped around her outer hull to carry these fuels and a streamlined sail. After a few tests, the concept was dropped in 1951 as impractical, and Guavina served in the test role for a few years under the designation AGSS. In 1957, she converted back to the oiler/tanker role and carried the designation AOSS. This time, she experimented with refueling seaplanes at sea, which was potentially important, as refueling the nuclear-capable Martin P6M Seamaster at sea could improve the Navy's strategic strike capabilities. However, this mission, too, was dropped and Guavina was decommissioned.