The longest-tenured coach in program history, Fallon is the Chargers all-time leader with 148 career wins and a .667 winning percentage (148-74).

In 2018, Fallon led the Chargers to 12 total wins, including nine wins in NE10 action. During the season, Fallon coached three Chargers who were named to the IWLCA All-East Region squads, including midfielder Mackenzie Reh (First Team), attack Jessica Mazliah (Second Team), and defender Raven Linton (Second Team). In addition, Reh highlighted the trio as she was named an IWLCA First Team All-American and was the NE10 Midfielder of the Year, the first All-American and major NE10 award winner since Corinne Fisher earned the same honors in 2016. In addition to those three, Courtney Duffy and Emily Holland were each named to the NE10 All-Conference teams.

In 2017, the women's lacrosse team earned a spot in the NCAA tournament for the fourth consecutive season after boasting a 15-5 overall record and 11-2 mark that season. During that season, Fallon mentored three IWLCA All-Americans and All-North region selections, with Kendall Cietek, Nicole Belanger, and Hannah Johnson all earning the honor. In addition to those three, Caitlyn O'Brien was also an All-North region, with six total Chargers being named to the NE10 All-Conference team.

The 2016 squad earned an NCAA Tournament berth for the third consecutive season. The team won three contests against ranked opponents including a 10-0 shutout over No. 14 Stonehill, the programs first blanking since 2003. Fallon saw senior Corinne Fisher crack the record books, as she entered the programs top ten in total points, goals and assists while fellow senior Maya Szymanski also broke into the top ten in assists. Fallon guided her players to seven All-Conference nominations and seven IWLCA awards.

In 2015, the program continued to excel, qualifying for its second consecutive NCAA Tournament appearance as Fallon once against garnered Northeast-10 Conference Coach of the Year accolades. The team won its first ever game against Adelphi, snapping a 36-game winning streak for the top-ranked Panthers. Fallon also mentored the IWLCA Division II National Defensive Player of the Year, Brittany Ast and saw Kathryn Campbell become the second player in school history to reach the 300 point mark in her career.