The Air Force is restarting a focus on long-term developmental planning, or a game plan to develop a better technology product over time, according to the service’s top officer.Air Force Chief of Staff Gen. Mark Welsh said Wednesday developmental planning is a process where a group starts by looking at Air Force capabilities, threats and technology developments 20 to 30 years into the future. They also assess future gaps and shortfalls from the Air Force’s own technology and aircraft fleets…