An investigation has found that pilot-error caused a T-38C Talon to crash  at Ellington Field, Texas on Feb. 14. Capt. David M. Cook,  a pilot with the 14th Flying Training Wing at Columbus Air Force Base, Miss., was flying the air craft when  he apparently mistook the landing runway, lost altitude too quickly and allowed his airspeed to fall below a safe level,  according to a press release from the Air Force.  His fatigue also was cited as part of the reason for the crash. The crash occurred while Cook was flying during the fourth sortie of the day as…