What will the troops being sent to the US southern border do?

The video discusses the increase in military presence at the U.S. southern border, with 1500 additional troops ordered by the Pentagon, marking a 60% increase since Monday. The Biden administration had previously stationed 2200 service members for ministerial duties, but Trump's orders expand their role. Acting Secretary of Defense Robert Salas stated the military will enhance detection and monitoring, and support deportation flights. The Pentagon hints at more missions, including constructing barriers. Additionally, federal agents like DEA and US Marshals may take on immigration duties, acknowledging ICE's limited resources.

What has been hinted at by leaders at the Pentagon regarding future military missions?

Which federal agencies may be assigned more immigration-related duties traditionally reserved for ICE agents?