(b) Application. The circumstances under which use of this authority may be appropriate include, but are not limited to, the following:

(i) Supplies, services, or construction needed at once because of fire, flood, explosion, or other disaster.

(ii) Essential equipment or repair needed at once to—

(A) Comply with orders for a ship;

(B) Perform the operational mission of an aircraft; or

(C) Preclude impairment of launch capabilities or mission performance of missiles or missile support equipment.

(iii) Construction needed at once to preserve a structure or its contents from damage.

(iv) Purchase requests citing an issue priority designator under DoD Manual 4140.01, Volume 5, DoD Supply Chain Materiel Management Procedures: Delivery of Material, of 4 or higher, or citing “Electronic Warfare QRC Priority.”