aha! found it.
Johnnie Johnson, Wing Leader (1956)
It is fascinating to watch the reactions of the various pilots. They fall into two broad categories; those who are going out to shoot and those who secretly and desperately know they will be shot at, the hunters and the hunted. The majority of the pilots, once they have seen their name on the board, walk out to their Spitfires for a pre-flight check and for a word or two with their ground crews. They tie on their mae-wests, check their maps, study the weather forecast and have a last-minute chat with their leaders or wingmen. These are the hunters.
The hunted, that very small minority (although every squadron usually possessed at least one), turned to their escape kits and made quite sure that they were wearing the tunic with the silk maps sewn into a secret hiding-place; that they had at least one oilskin-covered packet of French francs, and two if possible; that they had a compass and a revolver and sometimes specially made clothes to assist their activities once they were shot down. When they went through these agonized preparations they reminded me of aged countrywomen meticulously checking their shopping- lists before catching the bus for the market town.
