Award of an Indefinite Delivery, Indefinite Quantity contract was made on a sole source basis to AAR Supply Chain, Inc. for the procurement of AR Modular RF Corp. brand name radio frequency (RF) amplifiers. AR Modular RF Corp. is the only manufacturer that provides RF amplifiers that meet all requirements and ensure interoperability of existing systems. AAR Supply Chain, Inc. is the only authorized distributor of the required amplifiers. The period of performance is one one-year ordering period.