As the flight hours of the latter depleted in 1959 they were withdrawn from service .
In addition brand new Ilyushin Il - 28 ( between 10 and 12 ) jet bombers were delivered to be used in the reconnaissance role .
As the flight hours of the latter depleted in 1959 jet bombers were withdrawn from service .
In addition brand new Ilyushin Il - 28 ( between 10 and 12 ) jet bombers were delivered to be used in the reconnaissance role .