 The Coast Guard introduced the new "Operational Dress Uniform" (ODU) uniform in 2004 to replace the "Working Blue" and "Undress Blue" uniforms (winter and summer variants).Resembling law enforcement SWAT fatigues, the first generation of ODU differed substantially from the then-current Battle Dress Uniform in that the blouse lacked lower pockets and was intended to be worn tucked into the trousers.The blouse sleeves were allowed to be worn rolled up or down according to personal preference.