Sooner or later, fans of Navy football will know who to root against when it comes to conference play. The latest shuffle: The Louisville Cardinals will leave the Big East and join the Atlantic Coast Conference, according to an ESPN report, replacing Maryland, which will bolt for the Big Ten in 2014. This leaves the Big East with 13 football programs for 2015, Navy’s inaugural season: The Mids; current members Cincinnati, Connecticut, South Florida and Temple; previous expansion announcements Boise State, Central Florida, Houston, Memphis, San Diego State and Southern Methodist; and recent additions East Carolina and Tulane. For those…