The 105's? Just to rattle them in the tunnels....OK, for once I say remember the KISS principle. You don't need 40mm and 105mm cannons with all of the bells and whistles to interdict the border. You just need this (AC-47) with 3xM134 7.62mm Miniguns, Basketball (M24 flares), and FLIR.
Also? They make grape for the 105's........