Final answer:
The Department of Defense Instruction and the Uniform Code of Military Justice are the references that disallow waivers for commissioning or enlistment in the Navy for individuals with sexual assault convictions or required sex offender registrations.
Step-by-step explanation:
The reference that states waivers will not be granted for commissioning or enlistment in the Navy when the person has a qualifying conviction for a crime of sexual assault or is required to be registered as a sex offender can be found in the Department of Defense Instruction (DoDI) and the policies entrenched in the Uniform Code of Military Justice (UCMJ). The DoDI governs enlistment standards and military justice across all branches of the U.S. military, while the UCMJ provides a uniform set of criminal laws specifically for the armed forces. The UCMJ establishes the legal standards and proceedings for military members, including crimes and their respective punitive actions. A history of sexual offenses precludes individuals from serving due to the nature of military discipline and the standards of conduct expected of military personnel. Hamdan v. Rumsfeld illustrates that the military judicial system, including the treatment of severe offenses, operates under the strict guidance of laws and conventions to maintain order and discipline within the armed forces.