Another difficult issue at the time was that the Steelers and Eagles were bitter intrastate rivals (much like the NHL's Pittsburgh Penguins-Philadelphia Flyers rivalry of today) and usually both teams ended up near the bottom of the standings each year. The Steagles were the only professional sports team where all the players held full-time war jobs as it was a requirement of the team. Playing football was seen as an extracurricular activity. All of the 22 players on the roster kept full-time jobs in defense plants. One of Pittsburgh's players, Ted Doyle, worked at Westinghouse Electric and figured out later that his work assisted the Manhattan Project, which was America's effort to build the first atomic bomb, according to Matthew Algeo's book "Last Team Standing".