Taps

It took years of practice, but Softshoe Kelly learned to encode secret messages in his tapdancing.
He started simple, but his skills soon gave him the ability to transmit complex messages without anybody suspecting a thing.
When he was captured by the enemy, they paraded him in front of a global television audience.
Softshoe Kelly performed his act, and cryptology experts determined that he’d been treated miserably but had quite a lot of information on their weak points.
With this information, the enemy was defeated, but Kelly was mortally wounded in the assault.
At his funeral, the military played Taps.