However, I had to return the can as I'm not licensed to have it.

When a friend's wife inherited a farm he called the Army up at Aberdeen to
inquire what was in some cans he'd found in the barn. They had Army labels
on them. They sent out two guys that put e-suits on to remove it and a fair
bit of dirt floor under the shelving. They never did tell him what it was,
but apparently his father-in-law somehow 'obtained' it for clearing brush.
At least it wasn't like the mustard gas they found buried in DC a couple of
years ago.