(CNN) The Pentagon has sent Congress a list of projects that could be impacted by President Donald Trump's decision to declare a national emergency and repurpose military construction funds to pay for his sought-after border wall with Mexico.

The list, which includes a pool of projects valued at $12.9 billion that are "unobligated," meaning that construction contracts have yet to be awarded.

Should acting Secretary of Defense Patrick Shanahan "determine that construction along the southwest border is necessary to aid the mission of military personnel supporting the Department of Homeland Security, some projects within this pool may be used to fund up to $3.6B in barrier construction," Lt. Col. Joe Buccino, a spokesman for the Pentagon told CNN.

However, the Pentagon provided little guidance as to which of the hundreds of projects listed would be cut or delayed to shifts funds to build the wall.

Buccino said that no military housing, barracks, or dormitory projects will be impacted and that only projects with award dates after September 30 will be potentially tapped.

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