This is a sole-source firm fixed-price purchase order awarded by the Medical Command (MEDCOM) of the U.S. Department of the Army (DA) to Varian Medical Systems, Inc., a foreign-owned subsidiary of Siemens AG, for $195,000.00 to provide maintenance services for the Madigan Army Medical Center's Varian Trilogy and Calypso linear accelerator systems. The award was made under the authority of Federal Acquisition Regulation (FAR) 13.106-1(b)(1)(i) - Only One Source Reasonably Available, as Varian is the original equipment manufacturer (OEM) and holds proprietary rights. The award has no set-aside designation. Varian is a major provider of radiation therapy equipment, software, and services to federal healthcare agencies including the Department of Veterans Affairs (VA), Defense Health Agency (DHA), and National Institutes of Health (NIH), often through indefinite delivery vehicles (IDVs) and grants.