No smoking gun in USN fast jet physiological episodes

A U.S. Navy investigation into persistent oxygen and pressurization issues on the Boeing F/A-18 and T-45 has failed to narrow a single cause behind the problem. Therefore, the service will tackle the problem from multiple angles.

Defense.gov News Photo 110616-N-VE240-057 - U.S. Navy Airman Jessica Tescher left a parachute rigger performs a monthly maintenance check on a pilot s helmet during Exercise Northern Edge
By English: Petty Officer 2nd Class Rufus Hucks, U.S. Navy (www.defense.gov) [Public domain], via Wikimedia Commons