US Army with the exception of distinctive name patches with copper lettering. The footwear worn with ABUs are coyote brown suede boots and head covering is the OCP pattern Patrol Cap or ball cap, or the beret of the relevant career field (Security Forces, Special Operations Weather Team, SERE Instructor, Pararescue, and Combat Controller). Aside from OCPs, the most common uniform to be worn would be dress blues, which incorporate a light navy blue for bottoms, and the same shade to match the top jacket. Underneath the top jacket either a long sleeve or short sleeve sky blue shirt may be worn with a tie or neck tab whenever wearing the top jacket. The jacket is reserved for more formal events. Placed on the outermost tunic, Airmen may pin their ribbons and career badge as optional with their name plate as the only mandatory item. For headgear a flight cap of matching shade to the pants and similar in appearance to the former Army green garrison cap and the shoes are a black high polished dress shoe. Other, but not standard, headgear includes the flat top mess dress cap and the appropriate beret career field beret. Blues, though the second most used uniform, receive far less service than OCPs. Those performing duties not suited for the formal dress uniform may wear OCPs instead. The Mess Uniform uses the same pants and jacket as dress blues, but with a white under-shirt, bow tie and cummerbund, and the same black dress shoes (DAFI 26-2903). Purpose Distinctive clothing One purpose of military uniforms is to clearly distinguish combatants who are protected by the laws of war from other persons carrying weapons, who do not always enjoy such protection. Another purpose in historical times was to make it difficult for deserters to avoid detection; military uniforms were so distinctive with many metal buttons and unique colours that they could not be modified into unrecognisable clothing. If the commander raised and equipped the troops out of his own pocket, the appearance of the soldiers was also designed to impress his superiors. Attractive or distinctive uniforms could make a military career desirable to young men (the "peacock" factor). As late as 1914 the British Army found that regiments with particularly striking off-duty or parade uniforms found it easier to attract recruits. Thus the four Rifle regiments in their sombre dark green had a higher public profile