Junior Andy Smith added 12 points and 5 rebounds for Army and hit 3-8 from 3-point range.
Guard Joey Payton 10 for the Cadets who have now won two in a row.
Fairleigh Dickinson was led in scoring by Matt Hammond with 26.
With the win the Black Knights improve to 4-7 on the season. Army next plays at Holy Cross on Saturday at 3:15 p.m.
Fairleigh Dickinson falls to 5-5 with the loss. The Knights host Long Island on Saturday at 7 p.m.