As an aviation safety officer at Kandahar Air Base assigned to Task Force Out Front, I was a pilot in command (PC) and air mission commander (AMC) and flew more than 150 combat missions responding to numerous troops-in-contact calls in Kandahar province. During my deployment, we had a mid-air collision with an unmanned aircraft system (UAS) because communication and tracking of UASs between ground units within the same brigade was ineffective. Here’s what happened.