I assume that's for a civilian. I wonder if the offense is made more serious by the fact that he still held an officers' commission in the US Navy?
You ask an interesting question. If he was still a member of the Fleet Reserve, he would be subject to the UCMJ. If he was subject to the UCMJ, a veritible cornucopia of charges could be applied. (Assuming this could be tied to a treasonous act, which is a capital crime -- and if I remember right, would thereby have no Statute of Limitations?)
If the punative articles of the UCMJ came into play ....
Here's a site that details the punative articles of the UCMJ and has very good, detailed explanation of the various elements of the offense, if you click on the individual UCMJ Articles:
http://usmilitary.about.com/library/milinfo/mcm/blmcm.htm