Navy managed just three goals in the last three periods of the game, and suffered at 12-7 loss at Jacksonville in its 2018 season opener.
Chris Hill and Casey Rees scored two goals apiece for the Mids (0-1), who fell behind 5-4 after one period and failed to generate much offense after that.
Ryan Wade, Christian Daniel and Jack Ray added single goals for Navy, which will play at Maryland on Saturday.
Greyson Torain, Daniel and Wade contributed two assists each, while Jack Ray also recorded an assist for Navy (0-1).
Dwayne Mattushik scored five goals for Jacksonville, while Eric Applegate added three goals.