Reports from both the Associated Press
state that the 150 troops despatched would also act as a contingency force should the violent civil war in Syria spread to nearby states such as Jordan, Lebanon or Iraq.
U.S. Defense Secretary Leon Panetta outlined this when he stated that the U.S has "a group of our forces there, working to help them [the Jordanians] build a headquarters to ensure that we make the relationship between the United States and Jordan a strong one so we can deal with all of the possible consequences [of the Syrian civil war spilling over its borders]."
Syria has a large stockpile of biological and chemical weapons, the Syrian regime has stated it will not use such deadly weapons against its own people, but will not rule out their use against attacking foreign powers.
The U.S. believes these weapons are relatively secure. Recent intelligence suggests that some were moved by the Syrian state in order to ensure their security.
The U.S. in the meantime has provided humanitarian aid in order to help Jordan deal with the 200,000 or so Syrian refugees presently in Jordan.
This development comes as tensions between Syria and Turkey remain high following the former's forces shelling and killing five Turkish civilians last week.