The U.S. Navy built 51 Perry frigates, but all have been decommissioned. Most of them were scrapped, sunk, and turned into fish habitat and transferred abroad to U.S. allies.

According to navy.mil, "O2N2 Plants Bring Life to Airwing Pilot," O2N2 plants provide oxygen to the aviators, nitrogen to the air wing, and gas forms of both for use throughout the ship.