THIS REQUIREMENT IS RESTRICTED TO IRON MOUNTAIN SOLUTIONS, INC. (CAGE: 4PM50), IAW 10 U.S.C. 2304 (c)(1) FAR 6.302-1. ONLY ONE RESPONSIBLE SOURCE AND NO OTHER SUPPLIES OR SERVICES WILL SATISFY AGENCY REQUIREMENTS. THIS IS A ONE-TIME BUY (OTB), FIRM-FIXED-PRICE (FFP) EFFORT FOR TWO (2) OF NOUN: EMULATOR T5 ENGINE, NSN: 4920-01-615-5782, PART NUMBER (PN): 1043644-001, IN SUPPORT OF THE CH-47 TURBINE ENGINE (T55) WEAPON SYSTEM.