The Defense Threat Reduction Agency (DTRA) requires preventative maintenance and extended service for four Miniature Continuous Air Monitoring Systems (MINICAMS) to detect chemical warfare material during treaty inspections. The work will be performed in Chantilly, Virginia. This is a follow-on contract action without full and open competition. The period of performance includes a 12-month base period with four 12-month option periods, beginning on or about August 31, 2026. No budget amount is specified.