Washington DC – A National Guard deployment meant to bolster public safety in the US capital has turned into a national flashpoint after 20-year-old soldier Sarah Beckstrom died from injuries sustained in a close-range shooting near Farragut Square. The attack, which also left 24-year-old Andrew Wolfe critically injured, has intensified scrutiny of federal security operations and triggered political debate over immigration from conflict-torn countries. Authorities say Rahmanullah Lakanwal, a 29-year-old Afghan national who arrived in the US under a post-withdrawal protection program, was arrested moments after the attack. Federal prosecutors announced on Friday that initial assault charges would be upgraded…