Original sentence: Despite its considerably smaller size and limited capabilities, the PAF launched a pre-emptive strike, Operation Chengiz Khan, against Indian airbases.During the Kargil War with India, while none of the PAF aircraft played a role, the Pakistan Air Force Air Defence unit shot down an Indian Air Force MiG-27 on May 27, 1999 which had entered Pakistani air-space.Four IAF personnel were killed on May 28 when a MI-17 helicopter was shot down by Pakistan air defence units.However, on the eastern front, it did not achieve its mission objectives of completely neutralizing the IAF because the PAF only had one operational squadron stationed in East Pakistan.Pakistan claimed that these two aircraft had violated the LoC and crossed 7 miles in to Pakistani air space before being shot down by PAF Air Defence and Pakistan Army SAM and AAM, though India maintains that it was in Indian territory and that the aircraft were shot down by the infiltrators using Stinger missiles that they claim  were later recovered
Edited sentence: At the end the war turned out to be a failure for pakistan.Despite its considerably smaller size and limited capabilities, the PAF launched a unsuccesful pre-emptive strike, Operation Chengiz Khan, against Indian airbases.During the Kargil War with India, while none of the PAF aircraft played a role, the Pakistan Air Force Air Defence unit shot down an Indian Air Force MiG-27 on May 27, 1999 which didnt Pakistani air-space.Four IAF personnel were killed on May 28 when a MI-17 helicopter undertaking rescue and medical operations was shot down by Pakistan air defence units.However, on the eastern front, it did not achieve its mission objectives of neutralizing the IAF because the PAF only had one operational squadron stationed in East Pakistan.Pakistan claimed wrongly that these two aircraft had violated the LoC and crossed 7 miles in to Pakistani air space before being shot down by PAF Air Defence and Pakistan Army SAM and AAM, though India maintains that it was in Indian territory and that the aircraft were shot down by the infiltrators using Stinger missiles that they claim  were later recovered