The following is taken from the Navy Regulations on Officer Development (ROD):
https://www.netc.navy.mil/Commands/Naval-Service-Training-Command/ROD_and_Appendices/
(Page 6-8)
LOA. LOA is an administrative tool which suspends NROTC benefits. Performance-related LOAs
are discussed below. Other types of LOAs are discussed in Section 4-28. When considering
circumstances for which this manual directs an LOA, the PRB must verify said circumstances before
recommending LOA. The decision to place a student on LOA is at the PNS discretion and, unless an
exception is provided below, requires a PRB.
The PNS shall issue a letter notifying any student placed on
LOA and shall be acknowledged by the student with date and signature. The letter shall state precisely
the nature of the concern, identify remedial actions required of the student, and warn that failure to correct
the deficiencies or identification of further deficiencies may result in disenrollment.
a. Interim LOA. The PNS may assign interim LOA pending further investigation.
(1) A PRB should be held as soon as possible after assigning an interim LOA. Situations where
this may be appropriate include, but are not limited to, a midshipman failing to meet program
requirements by the end of their freshman year or a student charged with a crime by civil authorities that
is a major offense as defined in 3-19. If the board recommends an LOA, and the PNS concurs, the
interim status will transition to a regular LOA.
(2) A PRB is not required for interim LOAs issued for any midshipman who is being investigated,
charged with, or is pending prosecution for any infraction which might lead to disenrollment on
disciplinary grounds. Place the student on interim LOA until the matter is fully resolved and consult
NSTC N93 and NSTC Staff Judge Advocate (SJA). Ensure associated OPMIS entries are made.
The ROD has more info on LOAs, what the effect is, the reasons a midshipman could be placed on one, etc. It also details the PRB process.
The part I bolded applies to after being placed on LOA, but I he should have been given something in writing notifying him of the LOA detailing the exact reasons for the LOA. I'm not sure what you meant by "His GPA is there as well as his PFT scores". Are his GPA and PFT scores below requirements as well? As far as his email address, has he received other communication from the unit? By this point he shoul dhave had regular contact via email with his unit on a variety of subjects. There are a number of possible results from a PRB from a warning, to probation, to LOA and finally disenrollment. These can be found in the ROD as well. Make sure your DS gets all the information he needs to understand the allegations against him and what he needs to do to correct the situation