The U.S. military has grounded some F-35 fighter jets after a crash forced a pilot to eject from the Marine Corps version of the aircraft earlier this month in Texas. An unspecified number of planes are being investigated as part of a Time Compliance Technical Directive (TCTD), issued by the F-35 Joint Program Office (JPO) on Tuesday, an official from the office confirmed to The Hill Thursday. The directive recommended “restrictions on a small number of aircraft, which have been evaluated to be of higher risk, from flight operations and…