The museum's collection includes a large military vehicle and aircraft collection, the only Civil War cannon mounted on a carriage on museum display in New Jersey, a Civil War era submarine and a 20th century small arms collection.

The museum also houses an extensive manuscript and photograph collection, featuring original and copy material relevant to state political and military history.  Notably, the museum has the largest collection of New Jersey related Civil War research material in the country, including copies of diaries, letters, newspaper clippings, memoirs, regimental histories and articles.