This is a Sources Sought notice for a potential follow-on contract for software maintenance and updates to the Nuclear Enterprise Tactical Assault Kit (TAK) used on Department of War CBRNE systems. The government currently intends a sole-source award to the incumbent, Charles Stark Draper Laboratory, Inc., but is seeking capability statements from other vendors to determine if a competitive procurement is possible. The contract value for the current award is $1,651,562.00, with a completion date of 29 September 2026. Interested vendors must submit a detailed capability statement and address specific technical questions related to CBRN sensor integration, TAK server administration, and security protocols. Responses are required via email by 09 March 2026.