From the Highlights: "In March 2017, the President of the National Border Patrol Council testified to Congress that Air and Marine Operations (AMO) flew 'very little' at night and that United States Coast Guard (Coast Guard) pilots had to fly missions for U.S. Border Patrol (USBP) agents in the Rio Grande Valley sector. We initiated an inspection in July 2017 to determine whether AMO and Coast Guard supported USBP Agents at night in the Rio Grande Valley sector."
Department of Homeland Security, Office of Inspector General, Report No. OIG-19-02
Department of Homeland Security Office of Inspector General: https://www.oig.dhs.gov/