FBI Criminal Record Check and Fingerprint Verification
People who need a US Criminal Record Check must apply straight to the FBI, as US Embassies and Consulates do not offer this service.

Chapter 2 - Background and Security Verifications - USCIS
6], which provides guidance on the procedures for background and security verifications for members or former members of the U.S. armed forces.

Common Questions About Identity History Summary Checks - FBI
To submit a fingerprint electronically directly to the FBI, you might visit a U.S. Post Office that offers this electronic submission service...