Parsy, To get a copy of WWII military records you write to National Archives for copies of military service records.
If possible you need his/her enlisted name, unit inwhich he/she served, branch of service(infantry,cavalry,air force or etc.),enlistee or draftee, and any other information that would help them pinpoint the correct person.
Are you looking for any Carroll's? Larry G. Carroll firstname.lastname@example.org