WASHINGTON, June 7 -- The condemned men have been waiting at Fort Leavenworth for years, some for decades. Their cases wound through military courts, their sentences confirmed, their appeals exhausted or pending. What they have been waiting for - and what every president since Dwight Eisenhower has declined to provide - is a signature.

That calculus may be shifting. The US Army has prepared a detailed classified logistics plan, codenamed "Operation Resolute Justice," to carry out the executions of four military death row inmates should President Donald Trump issue the required presidential execution order, according to an internal planning document reviewed by ABC News. If activated, the plan would produce the first execution of an Ameri...