One of the single most important things you must do in the military is complete things on time. USNA gives candidates from approx. 1 June until 31 January to complete their packets. That's 8 months. It is now March 1, which means 9 months have passed.
There is a view that candidates who can't meet that deadline aren't truly interested or motivated.
If there is some unusual explanation for tardiness (i.e., parent/sibling dying; house burned down), and only one or two items are missing, USNA MIGHT make an exception. Likewise, if an extremely qualified candidate can show he/she didn't even know about USNA until very late in the cycle, there might be an exception (had this happen once and the candidate was admitted but he/she REALLY kicked it in gear and had almost everything in by the deadline).
However, as a general rule, miss the deadline and you're done for the year. You can't be considered for NAPS if your application isn't in so I would expect that is done as well.