Any person who—

(1) aids, or attempts to aid, the enemy with arms, ammunition, supplies, money, or other things; or

(2) without proper authority, knowingly harbors or protects or gives intelligence to, or communicates or corresponds with or holds any intercourse with the enemy, either directly or indirectly;

shall suffer death or such other punishment as a court-martial or military commission may direct. This section does not apply to a military commission established under chapter 47A of this title.