PGI 206.302-2  Unusual and compelling urgency.

(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 4140.1-R, DoD Materiel Management Regulation, of 4 or higher, or citing "Electronic Warfare QRC Priority."