What political activities are members of the Armed Forces permitted to do?
A member on active duty may:
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Register, vote, and express a personal opinion on political candidates and issues, but not as a representative of the Armed Forces.
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Promote and encourage other military members to exercise their voting franchise, if such promotion does not constitute an attempt to influence or interfere with the outcome of an election.
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Join a political club and attend its meetings when not in uniform. See Directive 1334.1.
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Serve as an election official, if such service is not as a representative of a partisan political party, does not interfere with military duties, is performed when not in uniform, and has the prior approval of the Secretary concerned or the Secretary's designee.
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Sign a petition for specific legislative action or a petition to place a candidate's name on an official election ballot, if the signing does not obligate the member to engage in partisan political activity and is done as a private citizen and not as a representative of the Armed Forces.
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Write a letter to the editor of a newspaper expressing the member's personal views on public issues or political candidates, if such action is not part of an organized letter-writing campaign or a solicitation of votes for or against a political party or partisan political cause or candidate.
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Make monetary contributions to a political organization, party, or committee favoring a particular candidate or slate of candidates, subject to the limitations under 2 U.S.C. 441a, 18 U.S.C. 607 and other applicable law.
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Display a political sticker on the member's private vehicle.
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Attend partisan and nonpartisan political meetings or rallies as a spectator when not in uniform.
http://www.ig.navy.mil/complaints/Complaints (Political Activities of Military Members).htm