From what I've read, according to the Constitution, there can be no treason without a declared war going on. That's why Julius and Ethel Rosenberg were tried for espionage and not treason. The cold war didn't count as a declared war. If Milley had been caught aiding Al Qaeda, that would be considered treason, since they are considered a war adversary. This is just what I've read, maybe someone else knows more.
From what I've read, according to the Constitution, there can be no treason without a declared war going on. That's why Julius and Ethel Rosenberg were tried for espionage and not treason. The cold war didn't count as a declared war. If Milley had been caught aiding Al Qaeda, that would be considered treason, since they are considered a war adversary. This is just what I've read, maybe someone else knows more.