By Daniel Bates When the USFL kicks off next week, viewers may notice that there won’t be a chain gang measuring the first down. Instead, the league is planning to innovate by using a measuring system akin to the replay system in tennis. Where a chip is placed in every football, and a virtual first-down line exists that will measure whether the ball crossed or not. The USFL tweeted out an example of the technology in-game on Friday. That isn’t the only innovation the league is bringing to the table, however. The USFL will also have two players from each team rigged with a helmet cam throughout…