American Forces Press Service
WASHINGTON, Jan. 17, 2008 – As U.S. servicemembers and Defense Department civilians ponder candidates during the election season, they should realize there are limits placed upon their involvement in certain political activities.
Political-related "dos and don’ts" pertaining to military members of all service branches are proscribed within Defense Department Directive 1344.10, titled: Political Activities by Members of the Armed Forces on Active Duty. The federal Hatch Act delineates what federal civilians, including those working for the Defense Department, may or may not do in the political realm.
http://www.defenselink.mil/news/newsarticle.aspx?id=48694
DODD 1344.10, Political Activities by Members of the Armed Forces on Active Duty http://www.dtic.mil/whs/directives/corres/pdf/134410p.pdf
Hatch Act for federal employees http://www.osc.gov/ha_fed.htm