May have been "Under other than honorable".
He could not have been given a dishonorable discharge without a courts martial.
However, I supsect that for officers an admin discharge for an naval officer Under other than honorable conditions warrents the same as an enlisted person. Here is what the UCMJ says about enlisted folks:
Under Other Than Honorable Conditions. OTH Discharges are warranted when the reason for separation is based upon a pattern of behavior that constitutes a significant departure from the conduct expected of members of the Military Services, or when the reason for separation is based upon one or more acts or omissions that constitute a significant departure from the conduct expected of members of the Military Services. Examples of factors that may be considered include the use of force or violence to produce serious bodily injury or death, abuse of a special position of trust, disregard by a superior of customary superior-subordinate relationships, acts or omissions that endanger the security of the United States or the health and welfare of other members of the Military Services, and deliberate acts or omissions that seriously endanger the health and safety of other persons.
Persons awarded an OTH characterization of service: are not entitled to retain their uniforms or wear them home (although they may be furnished civilian clothing at a cost of not more than $50); must accept transportation in kind to their homes; are subject to recoupment of any reenlistment bonus they may have received; are not eligible for notice of discharge to employers (which may affect unemployment benefits); and, do not receive mileage fees from the place of discharge to their home of record.
Here is the naval regulations. Have not had time to look over them yet.
http://usmilitary.about.com/gi/dynamic/offsite.htm?site=http://neds.nebt.daps.mil/Directives/5420174c.pdf
Wouldn't that be juicy!