On 9/18/2014, over at The Jackson Press website, MarkAlexander, in his commemorative article, ConstitutionDay - In the Company of Heroes, included this snippet:
On 30 April 1789, America’s first commander in chief, George Washington, took this presidential oath of office with his hand on a Bible opened to Deuteronomy 28. He ended his oath with “So help me God,” which was added to military oaths for officers by Act of Congress 29 September 1789.
In contrast, the U.S. Army Center of Military History website, Oaths of Enlistment and Oaths of Office says:
The first oath under the Constitution was approved by Act of Congress 29 September 1789 (Sec. 3, Ch. 25, 1st Congress.) It applied to all commissioned officers and privates in the service of the United States. It came in two parts, the first of which read: “I. A, B., do solemnly swear or affirm (as the case may be) that I will support the Constitution of the United Sates.” The second part read: ” I, A. B., do solemnly swear or affirm to bear true allegiance to the United States of America, and to serve honestly and faithfully, against all enemies or opposers whatsoever, and to obey the orders of the President of the United States of America, and the orders of the officers over me.” The next section of the chapter specified that “the said troops shall be governed by the rules and articles of war, which have been established by the United States Congress assembled, or by such rules and articles of war as may hereafter by law be established.”
No matter how fervently convinced Mark Alexander may be regarding his claim that “George Washington elected to use those same words in conclusion to the first oath of office as president,” he is definitely mistaken when he says that "So help me God" "was added to military oaths for officers by Act of Congress 29 September 1789.”