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To take charge of this post and all government property in view.
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To walk my post in a military manner, keeping always on then alert and observing everything that takes place within sight or hearing.
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To report all violations of orders I am instructed to enforce.
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To repeat all calls from posts more distant from the guardhouse than my own.
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To quit my post only when properly relieved.
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To receive, obey, and pass on the sentry who relieves me, all orders from the commanding officer, officer of the day, and officers and noncommissioned officers of the guard only.
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To talk to no one except in line of duty.
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To give the alarm in case of fire or disorder.
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To call the corporal of the guard in any case not covered by instructions.
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To salute all officers and all colors and standards not cased.
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To be especially watchful at night and, during the time for challenging, to challenge all persons on or near my post and to allow no one to pass without proper authority.
http://www.usmcpress.com/heritage/general_orders.htm