Though they were already playing as a traveling team, the Lucky 38 became the Mojave Baseball League's first official team on March 10, 2284.
Rose of Sharon Cassidy was named as the official owner since Lee would act as "commissioner," as he called it.
Cass' story leading up to ownership of the Lucky 38 team:
After the Second Battle of Hoover Dam, Cass and Lee became more than just “companions.” They became lovers. Lee had seized control of New Vegas, but gladly gave up the law side of things to the New California Republic. His only true possession from the Strip became taking over the Lucky 38, which was cleaned and immediately opened to the general public.
Lee, however, left the business side of things to Cass and later said it was hers to run. Cass, who is the former owner of Cassidy Caravans, had a lot of business savvy, and the Lucky 38 quickly established itself as a clean, affordable place for the casual gambler to hang out.
Cass also established a new, fun weekly gambling game: the Whiskey Rose Drink Off. Basically, players could gamble any amount of money they chose, with extra paid down for shots expenses. Then, everyone involved would sit at a table and take shots. Last man (or woman) standing won the pot. Unfortunately for the gamblers, sometimes Cass herself would enter. To ensure fairness, gamblers got to choose her shot. Cass was a perfect 18 for 18 when she played. The girl can drink!
With Lucky 38’s success, Cass was rich and powerful just like the rest of the strip casino owners. Lee revealed another of Mr. House’s secret vaults in the Lucky 38 to Cass: a baseball stadium-sized vault containing plenty of cash, jewels, and other valuables. Cass was already doing well with her casino, so she paid it forward and helped finance work crews for cleaning up various ruins around the Mojave.
By 2284 Cass was helping to finance rebuilding Nipton, Primm, and Boulder City. Through Lee’s request, she also put a lot of money into the Goodsprings’ coffers, allowing the city to more than quadruple in population in just under a year.
Cass was also one of the people offering financial aid to a number of fledgling and struggling businesses around New Vegas. Though she owns no stake in some of the reestablished companies around New Vegas, she is thought to have invested in the production of Sunset Sarsaparilla and H&H Tool Company. Also, she is for whom the newly established Whiskey Rose Caravan Company is named after.
I already showed the Lucky 38 jersey. It did not change from the prototype until the time of the Commission.