The 105th Infantry Regiment was an infantry regiment of the New York Army National Guard that saw combat in World War I and World War II. Originally, it was known as the 2nd New York Volunteer Infantry Regiment, but it was redesignated in 1916. The 105th fought as a part of the 27th Infantry Division during both World Wars, and was highly decorated for its actions during the Battle of Saipan, where its dogged defense against the largest Japanese Banzai charge of the war decimated its ranks, but prevented the American effort on the island from collapsing.