Code of Federal Regulations Title 48. Federal Acquisition Regulations System 48.23.570-2 223.570–2 Contract clause

(1) That involve access to classified information;  or

(2) When the contracting officer determines that the clause is necessary for reasons of national security or for the purpose of protecting the health or safety of those using or affected by the product of, or performance of, the contract.

(1) For commercial items;

(2) When performance or partial performance will be outside the United States and its outlying areas, unless the contracting officer determines such inclusion to be in the best interest of the Government;  or

(3) When the value of the acquisition is at or below the simplified acquisition threshold.