The Department of Defense, through the Defense Threat Reduction Agency (DTRA), is seeking specialized engineering services for the operational support of radionuclide monitoring stations as part of the Nuclear Arms Control Technology (NACT) program. The procurement aims to maintain and enhance the functionality of the U.S. portion of the International Monitoring System (IMS), which is crucial for monitoring nuclear detonations and mitigating impacts from various catastrophes. This initiative supports U.S. Government and DoD objectives under the Comprehensive Nuclear-Test-Ban Treaty (CTBT) and involves the operation of 11 monitoring stations across the continental United States, Alaska, Hawaii, U.S. controlled Pacific Territories, and Antarctica. Interested parties can contact James N. Robinson at james.n.robinson2.ctr@mail.mil or 571-616-5751, or Tabassam Salim at tabassam.s.salim.civ@mail.mil or 571-616-4221 for further details.