Another biplane+hangar scene

Now you’re talking, – engine porn!

A T-shirt pattern I once saw at Blenheim Society stand.

Mustangs look better inhabited.

A band of GIs on the beach…
a band of aircraft in a museum…

The band of the 1st Air Regiment, Polish Air Force, at the unit’s base in Warsaw-Okecie in late 1930s.

Another Junkers no longer in airworthy condition.

It was active for the RFC, and I’m sure re-imposed in W.W.II; it would’ve certainly applied to all units of the Advanced Air Striking Force in France, including fighter squadrons, and would have been a job for the Intelligence Officer to enforce during May 1940 – so I don’t think it likely for it to have been removed during the Battle, bureaucracy being what it is. However I can well believe it might not’ve been well enforced in later 1940.

OK, did it apply to all flying? Just ops? Or maybe just ops over enemy territory?
BTW, was a similar thing in force with the army? Or was it assumed that a front line infantry or tank soldier wouldn’t have anything interesting in his pockets anyway?

Were fighter pilots/air crews really required to do that during the Battle of Britain? I have always thought this rule was to be observed when the mission objective was over/in enemy territory?