The MK-XIX pressure suit. The suit is standard USSC issue for high altitude filght operations. The MK-XIX suit incorporates a neck seal gasket that can be coupled to the HGU-90P helmet. The helmet's faceplate is oversized in order to accomodate the IHDS optical unit that projects the aircraft's heads up display on the interior of the visor. The external visor has a gold anti-nuclear flash coating. Because the HGU-90P utilizes an oronasal area seal, the MK-XIX pressure suit cannot be used in vacuum with this helmet configuration.