During CENTO excercise, large shimmering gun metal grey UFO was seen by ground personel, IIAF alert aircraft were lanched to intercept. USAF aircraft were also in the airspace around base. UFO was visually tracked by USAF TAFT team members, US civilian advisers, and IIAF personel on the ground. USAF F-4s and IIAF F-4s visualy and RADAR tracked UFO. IIAF F-4 alert aircraft chased UFO and acheved RADAR lock. UFO responded by moving away at a rate that broke RADAR lock. The local IIAF ground radar station also tracked the UFO. All records were gathered up buy USAF personel, pilots stopped talking about it. All personel stopped talking about it.