In a U.S. Army North document obtained by Newsweek, Task Force Rhino submits a serious incident report (SIR) from an incident that occurred on May 19. "SIR received from TF Rhino, encounter from a distance of 400 meters with three individuals, one armed and aiming at the MSC [Mobile Surveillance Camera] operators. CBP [U.S. Customs and Border Protection] was notified and responded within minutes and apprehended the individuals. Task Force Rhino is made up of members from 1st Battalion, 23rd Infantry Regiment and 1st Battalion, 37th Field Artillery, according to the slide.