nit: USBP (US Border Patrol) is not at the ports of entry. Border Patrol is for the land border _between_ ports of entry. CBP (customs and border protection) is

nit: USBP (US Border Patrol) is not at the ports of entry. Border Patrol is for the land border _between_ ports of entry. CBP (customs and border protection) is the organization that does immigration control at the ports of entry.