The National Park Service seeks a small business contractor to replace outdated alarm systems at Antietam National Battlefield and optionally at Monocacy National Battlefield in Maryland. This acquisition is a 100% total small business set-aside under NAICS 561621, with a $25M small business size standard. The work includes replacing intrusion and fire alarm systems, testing, programming, and/or upgrades at twelve structures throughout Antietam National Battlefield, with an option for one structure at Monocacy National Battlefield subject to availability of funds. Anticipated performance is September 30, 2026 through December 31, 2026. Offerors must be registered and active in SAM.gov under the applicable NAICS code at all required times, including award and throughout contract performance.