Even though it was initially issued to U.S. Navy Chief Petty Officers, there's nothing petty about the CPO shirt. It's a cold weather classic crafted from thick wool, designed to be a layer U.S.Navy Senior Chief Petty Officer Dress Blue Uniform #99365687 US NAVY CPO DRESS BLUE & KHAKI TUNIC UNIFORM LOT in United States Navy Dinner Dress Uniform Etsy Uniform: Dinner dress blue, male Navy chief petty officers PICRYL Public Domain Media Search Engine Public Domain Search DVIDS Images CPO Dress Mess Blue Uniform [Image 3 of 10]