Replicating platforms accurately in simulations remains one of the biggest challenges for the Army, according to a service official. "As many of you know, we've been chasing concurrency for several years and we're a couple of years behind on each of the platforms and by the time we had caught up, a new platform had dropped," Col. John Ferrell, director of simulation for the Army Aviation Center of Excellence at Ft. Rucker, AL, said at an Association of the U.S...