Final answer:
According to 10 U.S.C. 509, the term of enlistment in the military can be extended up to eight years under certain circumstances.
Step-by-step explanation:
According to 10 U.S.C. 509, the term of enlistment in the military can be extended up to eight years under certain circumstances. This allows for longer periods of service beyond the initial enlistment period. However, it's important to note that the extension of enlistment is subject to specific regulations and requirements.