Coast Guard jumped out to a 16-8 lead before Roger Williams used a 12-4 run to take the lead 20-19 with 4:49 left in the half. Coast Guard led 28-24 at halftime.
The Bears led 47-38 when they went on a 15-4 run to put the game away as they led 62-42 with four minutes left.
Grant Johnson had 13 points for Coast Guard while Craig Johnson added 11 for the Bears (9-8).
Andrew Viana led Roger Williams (7-9) with 12 points and seven rebounds while Brandon Parrish added 10 points. The Hawks were 0 for 11 from three point range.