By this time Walker had flown 169 operational sorties, and it was decided to rest him.

No. 2 Group flew just over 57,000 operational sorties at a cost of 2,671 men killed or missing and 396 wounded.

I took him on his first operational sortie as my wingman.

He carried out his first operational sortie on 11 October 1940.

The aircraft were used for training, with no operational sorties being flown from the field.

The 1,300 operational sorties carried out in February had produced mixed results.

He finished the war with a total of 373 operational sorties without being shot down by the enemy.

The first operational sortie came on 12 May 1940.

He had flown over 500 operational sorties and accumulated 1,000 combat hours.

He had flown some 550 hours in over 300 operational sorties.