Comment: Historically

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Historically

I prefer the 1924 - 1954 version, I've been a WWII history enthusiast since I was a kid, and read the Battle of Midway.

http://www.amazon.com/Battle-Pivotal-Moments-American-Histor...

"I, __________, do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic."

https://en.wikipedia.org/wiki/Oath_of_enlistment

There is no duration defined in the Oath