But he said it was a challenge in these emerging and dynamic areas to "play aggressively right up to the line" of what was allowed under law and policy.
U.S. Central Command 'friending' the enemy in psychological war →
"Sometimes people think of the rules as these things that are fixed on paper," he said. "They're constantly changing; they interact with each other. There are constantly [new] interpretations coming down both internally and externally."