[9] Irvington High School's Crusader Battalion is the oldest Junior Reserve Officers' Training Corps (JROTC) program in the state of New Jersey.

Approximately 200 students participate in the program, of whom one third will continue on to enlist in the military, while the remaining two-thirds will move on to college or a job after graduation.

[18] The 1985 team won the Group IV title with a 58-53 win against Washington Township in the championship game played at the Brendan Byrne Arena.

[21] The boys basketball team won the Group IV state championship in 1993 (defeating runner-up Shawnee High School in the tournament final) and was declared as winner of the North III regional in 2020, after the group finals had been canceled due to COVID.

[24] The boys track team won the Group III indoor relay state championship in 2009 (as co-champion with West Windsor-Plainsboro High School North) and the girls track team won the Group III title in 2012 (also as co-champion with West Windsor-Plainsboro High School North).

[25] The football team won their first sectional championship in 2021 after defeating Middletown High School South in the North II Group IV tournament finals[26] and won the 2021 North Group IV regional championship after beating previously undefeated Northern Highlands by a score of 19-14 to finish the season with a record of 11-2.