The Department of Defense, through the Naval Surface Warfare Center (NSWC) Crane Division, intends to modify Contract N0016422DGP73 to increase the ceiling amount for the procurement of TR-333 Hydrophone Audio Transformers, which includes Foreign Military Sales (FMS). This sole source procurement is specifically designated for OECO, the only responsible source capable of meeting the agency's stringent requirements, which include extensive qualification processes such as inspection, certification, and operational testing. The TR-333 Hydrophone Audio Transformers are critical components for underwater sound equipment, essential for various defense applications. Interested parties may submit capability statements for consideration, and inquiries should be directed to Steven Junkins at steven.l.junkins2.civ@us.navy.mil, with all submissions requiring registration in the Government System for Award Management (SAM).