For what it's worth, in the February 1991 Daytona 500, during the height of Operation Desert Storm, there were five cars marked with "We Support Our Troops", one for each service.
http://www.jcs-group.com/military/support.html
The #71 Coast Guard car was a Chevy Lumina, driven by Dave Marcis. Decals for this model were made by JNJ, a long time ago. You can probably find a set for sale someplace.
Good luck,
Rick