Final answer:
NCIS Special agents and investigators must be trained in accordance with DoD Instruction 6495.02 and other legal references, such as Title 18 and UCMJ, to properly investigate sexual assault allegations.
Step-by-step explanation:
The Naval Criminal Investigative Service (NCIS) must train their Special agents and investigators to properly respond to and investigate allegations of sexual assault. They must adhere not only to the Department of Defense Instruction 6495.02 but also to other references which can include various federal statutes, such as Title 18, which covers federal crimes and criminal procedure including conspiracy, false statements, wire fraud, and mail fraud. In addition, investigators need to be familiar with the Uniform Code of Military Justice (UCMJ) and the Manual for Courts-Martial, as these also provide guidance on handling allegations of sexual assault within the military. Though not explicitly mentioned in the question, these sources are critical for establishing investigative procedures and conduct.