This F-16B (US FY 81-0936) has been delivered to the Pakistan AF under the FMS program "Peace Gate II". The 1st two digits of the Pakistani serial indicate the year it was delivered (1984), while the 6XX number were assigned to the dual seater (single seaters have 7XX numbers). Originally a Block 15 aircraft, it was later upgraded to Block 20 status. Note the kill mark in the form of an indian flag on the nose section of 84606, apparently being the aircraft which shot down an IAF MiG-21 Bison (Fishbed) on February 27, 2019.