Apparently Bernie Ecclestone and Formula One Management (FOM) weren't overly fond of the use of " F1" in the team's initially stated name. So it's out with USF1 and in with USGPE, which stands for US Grand Prix Engineering. We wouldn't be surprised to hear that Pontiac is now threatening a lawsuit, or perhaps sponsorship.
Just for clarification, Formula 1 has allowed "F1" in a team's name, but only if the word "Team" is also used. The lone exception is Williams, which officially goes by WilliamsF1. In related news, Force India was asked to revise their logo because "FI" looks too much like "F1". The team will now use a lowercase "i" in the logo to avoid confusion with the series. Got all that? So USF1 is now USGPE and Force India is now using "Fi" instead of "FI". Thanks for the tip, Ryan!