The Main Museum presents the role of the New Jersey Militia and National Guard within the context of the larger history of the state, using original and reproduction uniforms, weapons, photographs, artifacts and art from the period of Dutch, Swedish and British colonization through the War for Independence, Civil War and World Wars I and II to the present day, paying particular attention to the diversity of the New Jersey citizen soldier and his or her experience. The New Jersey National Guard since September 11, 2001 has a room, “A World Changed: The National Guard in the 21st Century” with a timeline of their activities displayed.
The Lawrenceville Annex is located at the Artillery Armory in Lawrenceville. Items on exhibit include weapons, uniforms and other equipment from various periods of service. There are two rooms dedicated to military memorabilia from the Civil War and a "Model Room" with over one hundred small-scale models of military equipment. Additionally, about 20 tanks, vehicles and cannon are on display outside.
The War Memorial Annex is located at the historic Trenton War Memorial. Items on exhibit include portraits of past Adjutant-Generals of the New Jersey National Guard, artifacts relating to the distinguished service of several state National Guard units, and an overview of the role of the Naval Militia.