I believe that that's a hangin' offence under the UCMJ.
Well, my copy of the UCMJ doesn't specify the method. But yeah, it says the penalty is, "death or such other punishment as a court-martial or military commission may direct." That's at 904. ART. 104. AIDING THE ENEMY
18 posted on 02/12/2004 2:19:14 PM PST by 68skylark