Correction: A previous version of this story misrepresented the available options for Javelin training; There are multiple approaches. This version also clarifies the status of SAIC’s block I Basic Skills Trainer. HUNTSVILLE, Ala. — Aspiring tank-killers around the world could soon blast armor in an upgraded simulated environment powered by a graphics engine used for the video game Fortnite. This reality is only awaiting an upgrade to defense contractor SAIC’s block I version of the Javelin