This is a firm-fixed-price purchase order awarded by the United States Marine Corps to K & R Custom Software Inc., a for-profit software development company, for Telephone Management System (TMS) software maintenance and related services. The contract has a ceiling value of $83,962.92 and a period of performance ending on August 22, 2023. This contract is not set aside for any specific business category. The original solicitation, a Special Notice, was for a sole-source award to provide the Marine Corps Installations East Telecommunications Support Division with TMS software maintenance, subscription services, and additional software for the French Creek location. K & R Custom Software Inc. is the sole provider of the proprietary TMS software and has a long history of securing federal contracts, predominantly from Army and Marine Corps organizations, for its telecommunications management solutions.