The Advanced Pressure Suit (APS) was a bladder type partial pressure suit designed and developed by Northrop and ILC Dover for the F-23 Advanced Tactical Fighter. Integrated high altitude, anti-G, Immersion, thermal air cooling and chemical defense protection. Suit bladder had pressure booties and oronasal/full head pressure for PBA and PBG. Breathing bladder/helmet/suit pressurized to 0.24 bar for altitudes above 11 km and 60 mmHg breathing/0.70 bar suit at +9z for anti-G protection. 6 each purchased by USN.