Such parachutists are considered hors de combat and it is made a war crime to attack them in an interstate armed conflict under Additional Protocol I to the 1949 Geneva Conventions.
Protocol I was added in 1977. World War II ended in 1945.
While some of the Geneva Conventions – not the relevant ones – predated World War II, Japan was not a party to even those until after World War II.
https://en.wikipedia.org/wiki/Attacks_on_parachutists
Protocol I was added in 1977. World War II ended in 1945.
While some of the Geneva Conventions – not the relevant ones – predated World War II, Japan was not a party to even those until after World War II.