The background check done when joining is not as thorough as a background check done for a security clearance. You only get a secret or top secret clearance if needed for your particular MOS or AFSC. Has this individual needed a secret clearance, that background check would have uncovered his fraud. I only had one post 9/11 secret clearance update and I answered a lot more questions on that one. No way he had a secret clearance.
Regardless, this guy should not have been in the USMC and once the fraud was detected, he should not have been given an HD. Also, he would have had to submit an SSN in addition to a birth certificate. Here are the crimes he was progably guilty of:
False Personation of a U.S. Citizen (18 U.S.C. § 911). Illegal aliens often present themselves as U.S. citizens, an act punishable by up to five years in jail, a felony. This law is often cited in immigration prosecutions and may involve, for example, an alien claiming U.S. citizenship to his employer.
Fraud and False Statements (18 U.S.C. § 1001). It is common for illegal aliens to make false statements to the government or on official documents. An illegal alien violates this law when claiming to be a U.S. citizen on an I-9 Employment Eligibility form and faces a fine and up to five years imprisonment.
Social Security Fraud (42 U.S.C. § 408). This statute has been invoked where an illegal alien provided a false Social Security number for the purpose of acquiring a job, where an illegal alien used a fraudulent Social Security number for the purpose of acquiring a driver's license, and when an illegal alien used a Social Security card belonging to a citizen in order to obtain Section 8 housing, for example. Violation of this statute can result in a fine and/or imprisonment up to five years. The court can also require violators to provide restitution to the victims.