sorry if this is a dupe but I didn’t see it anywhere and thought it bore mentioning.
this from Soldier Systems website:
Many military and Law Enforcement organizations are issuing the Combat Application Tourniquet. Unfortunately, a replica product built in Hong Kong by Element Airsoft and made to resemble the CAT has been showing up in medical equipment sets…
http://soldiersystems.net/2010/05/10/counterfeit-cat-tourniquets/