I asked Alexis about the Army tartan and here is her response:

The U. S. Army tartan was commissioned a year ago by a former U. S. Army "Dark Horse Unit" Vietnam veteran
named Raymond Jones.
Ray was tired of the fact that his brother, Eugene a
career U.S. Navy chief, had a military tartan to wear
and he did not.
Ray commissioned us to come up with a design and get
the tartan registered with the Tartan Registry in
Scotland.
We put all the U.S. Army colors in the tartan and Ray
is working with the Powers That Be to make it the
official U. S. Army tartan.