It's not a silly question, Keitta. In this instance, if he was wounded he would have been considered a casualty. Found online is this current Dept of Defense definition of a casualty: "Any person who is lost to the organization by having been declared dead, duty status – whereabouts unknown, missing, ill, or injured." Also listed online are these seven levels of DoD casualty status:
Deceased Duty status – whereabouts unknown Missing Very seriously ill or injured Seriously ill or injured Incapacitating illness or injury Not seriously injured
WWII era no doubt had similar definitions/status levels.