In 2017, the club joined
League1 Ontario, a Division III league, fielding a team in the men's division, using the club's nickname,
OSU Force. They defeated
Aurora FC in their inaugural match on April 29, 2017 by a score of 3–1. In 2019, they added a team in the
League1 Ontario women's division. For the
2020 season, the club moved both its male and female teams to the
Première Ligue de soccer du Québec, a league on the same pyramid level as L1O, but located in the province of
Quebec, in a move sanctioned by the
Canadian Soccer Association,
Ontario Soccer Association, and
Soccer Quebec. While previously, the Ontario-based
Ottawa Fury Academy had played in the Quebec-based league, this move represented the first time League1 Ontario and PLSQ have transferred a club between organizations. The move to play in a different province was approved to ease travel for both OSU and the other League1 Ontario clubs, as Ottawa was located closer to the Quebec clubs than any of the other Ontario teams. Due to restrictions put in place by the
Government of Ontario as a result of the
COVID-19 pandemic, OSU had to play home games in Quebec during the
2020 PLSQ season and required an exemption from the
Ontario Soccer Association to be eligible to participate making them the only Ontario-based club who was able to play competitive fixtures in 2020. OSU was able to strengthen their roster for 2020 due to travel restrictions put in place as a result of the pandemic. Several players who were to play for teams in the United States instead joined Ottawa's team, resulting in only two players returning from the 2019 team that finished last in L1O. Their first season in the PLSQ was interrupted by the pandemic and cancelled before its conclusion, with standings to be determined based on points per game earned in matches up to that date. The male team ultimately finished in second place behind
AS Blainville, following a 3–2 loss to Blainville, which was their only loss of the season, in the final match of the season before the cancellation, in which Blainville scored the winning goal in the final minute of the match. Midway through the 2021 season, the men's team was forced to withdraw from the league due to government restrictions and cross-border difficulties (the women had already completed their season), with their played matches removed from the rankings (they had a record of 1-2-7 at the time, sitting in 9th place). In recent years, the team has focused more on player development, with the club featuring the youngest average age in 2022 at 19 years old, several years younger than the rest of the teams in the league. == Seasons ==