Each uniform category is worn for different purposes and for certain occasions. The "PDU I" and "PDU IA" are regarded as "full dress uniforms" which are worn for formal state occasions and when attending ceremonial events of high significance. The headdress worn for this uniform is a peaked cap for men and a crusher cap for women, and for officers from special forces, as well as the Military Police, may wear their respective berets. When wearing the Mess dress uniform, no headdress is worn.