By Tech. Sgt. Bob Jennings, 442D Fighter Wing Public Affairs / Published May 18, 2021 Staff Sgt. Denis Silva, an officer trainee with the 442d Civil Engineer Squadron, holds his civilian process improvement certificates May 17, 2021, in his Florida office. Silva is the first total-force Airman to pass the Air Force's continuous process improvement black-belt-equivalency exam. Staff Sgt. Denis Silva, an officer trainee with the 442d Civil Engineer Squadron, holds his civilian process improvement certificates May 17, 2021, in his Florida office. Silva is the first total-force Airman to pass the Air Force's continuous process improvement black-belt-equivalency exam. Staff Sgt. Denis Silva, an officer trainee with the 442d Civil Engineer Squadron, earned this Six-Sigma Black Belt certificate through the American Society for Quality. Silva is the first total-force Airman to pass the Air Force's continuous process improvement black-belt-equivalency exam.