Investigators charged Derrick Gallagher, 31, of Petawawa with eight counts of sexual assault and two counts of voyeurism on April 1, in an investigation that began on March 29.
Additional charges were laid late last month, and Const. Peter Robertson said on Thursday that seven new alleged victims had come forward, bringing the total to 16.
The new charges are sexual assault, five counts of voyeurism, and break and enter with intent to commit an indictable offence, and Robertson says Gallagher now faces 27 charges in total.
OPP say they are being assisted in the ongoing investigation by the Canadian Forces National Investigation Service.
Robertson says provincial police are encouraging any female who has had contact with Gallagher to contact investigators.