This is a notice of a proposed sole-source contract to L3 Harris Technologies for the repair and sustainment of the B-52H AN/ALQ-172 Electronic Countermeasures System. The work involves repairing specific components, including various backplane assemblies, transmitters, and test equipment, as listed. The anticipated contract is a combination of Firm Fixed Price and Cost Reimbursement No Fee, with a five-year period of performance. The requirement is military-unique, and the necessary technical data is owned by L3 Harris, justifying the sole-source action. This notice is not a request for competitive proposals.