Audio problem: When Gunny's sister shows up at JAG, Gunny's mouth doesn't move when he greets her. (00:08:45)
High Ground - S1-E16
Audio problem: When Meg is preparing to join the Marines to search for Harm and Gunny Crockett, Col. Gordon warns her to cover her back. His mouth is very obviously saying "cover [your] ass."
Audio problem: When Mikey asks Bud if he can stay at the party in the bar, his mouth isn't in sync with the words. (00:35:25)
Answer: Officially, the individual has been ordered to attend, failing to could be interpreted as either, Failure to follow orders, dereliction of duty, going AWOL, or even desertion. It would depend on the underlying reason as to why the person doesn't appear.