US Air Force (USAF) AIRMAN First Class (A1C) Tesha Hopkins, Utilities System Apprentice, in training by USAF SENIOR AIRMAN (SRA) Jesus Davila Vega, Utilities System Journeyman, 355th Civil Engineering Squadron (CES), Davis-Monthan Air Force Base (AFB), Arizona (AZ), on the measurement and proper procedure for replacing plumbing lines