In a swearing in ceremony for all united states soldiers they swear to obey the orders of

 obey the orders of the Continental Congress and obey the orders of the Generals and officers set over soldiers by mentioned Continental Congress

Explanation:  Under United States Federal law, anyone who joins the military as well as those who re-enlist to serve in the military is required to take this oath. Today's military oath is rooted, logically, from the time of the American Revolutionary War when the oath was taken under the Continental Congress, then the text of the oath was somewhat different, since there was a change in the oath text from the first formulation of June 14, 1775.

The oath ceremony takes place in the presence of U.S. Army officers and of course in front of the United States flag.

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