The shipment was supposed to consist of thousands of 2,000- and 500-pound bombs, with U.S. concern being how the larger explosives could be used in Rafah.
On April 14, a National Guardsman assigned to Operation Lone Star "discharged a weapon in a border-related incident," the Texas Military Department said.
Authorities said the Guardsman turned around at a Border Patrol checkpoint and fled, leading to a 15-mile chase at speeds of more than 100 miles per hour.