Reviewed by GREG KING Director: Clint Eastwood Stars: Bradley Cooper, Sienna Miller, Kyle Gallner, Keir O'Donnell, Jake McDorman, Luke Grimes, Sammy Sheik, Navid Negahban, Eric Close, Owain Yeoman. In the late 70s and 80s, many filmmakers took an opportunity to revisit America's involvement in Vietnam and used their fresh perspective to criticise the country's involvement in the unpopular and …