No pain, no gain.
Нетипово, про пізнавальне.
Pilot's flight operating instructions for Army model P-39Q-1 airplane
www.wwiiaircraftperformance.org/P-39/P-39Q-1_Op...
This publication shall not be carried in aircraft on combat missions or when there is a reasonable chance of its falling into the hands of the enemy.
(...) Its transmission or the revelation of its contents to an unathorized person is prohibited by law.
Pilot's flight operating instructions for Army model P-39Q-1 airplane
www.wwiiaircraftperformance.org/P-39/P-39Q-1_Op...
This publication shall not be carried in aircraft on combat missions or when there is a reasonable chance of its falling into the hands of the enemy.
(...) Its transmission or the revelation of its contents to an unathorized person is prohibited by law.