Aircraft
by Nation
United States
Navy/Marine Corps (1923 - 1962)
Patrol: The
"P" for patrol designation is one of the original 1923
designations and is still in use today. In the late-1930s through
the end of World War II, patrol aircraft that carried their own bombs
acquired the designation "PB" for Patrol Bomber. Post-war
practice reverted to the single-letter "P" designation.