With plans in the works and troops on the way, military assumes a mostly familiar role on the border

SAN DIEGO (AP) — Dozens of Marines unfurled coils of concertina wire — one on the ground and one slightly above — making it more difficult to climb a border wall separating Tijuana from San Diego. They worked with speed and efficiency amid a weekend rush of cars nearby at the busiest border crossing between the U.S. and Mexico. Fortifying barriers …