The Army announced last summer that it would not return to NASCAR as a sponsor for 2013. The Navy and Marine Corps are also out of the NASCAR business. With rare exception. But the Air Force is back for 2013, renewing its deal to sponsor the Richard Petty Motorsports-owned No. 43 car, driven by Aric Almirola. The sponsorship lasts the entire season, but the Air Force will be the primary sponsor for two races on military-friendly weekends — the Coca-Cola 600 in Charlotte, N.C., over Memorial Day weekend and the Coke Zero 400 in Daytona Beach, Fla., two days after…