drop bear
Sr. Grandmaster
There are many traditional martial artists that have military records. Master Rhee was the lead instructor for the Korean 'Demon Hunter' Marines, who have verifiable military experience.
Then you would for example present that as proof if the situation came up. So the documentation of when it was used would be applicable.
I would throw this out if for example someone wanted to make a false allegations that sports systems are not battlefield systems.
And having a look it seems that tkd is separated into traditional and competitive.
Which is not always a line that is made in a martial art.