Petty Officer 2nd Class Matthew Hicks, a corpsman with II Marine Expeditionary Force (Forward), demonstrates the proper application of the newest combat action tourniquet. One of the updated features on the CAT is the attached time band, used to record when the tourniquet was applied to the casualty. - Petty Officer 2nd Class Matthew Hicks, a corpsman with II Marine Expeditionary Force (Forward), demonstrates the proper application of the newest combat action tourniquet. One of the updated features on the CAT is the attached time band, used to record when the tourniquet was applied to the casualty.