most armies have some form of camouflaged uniform, such as the British Disruptive Pattern Material. Many modern military forces now use a system of combat uniforms that not only break up the outline of the soldier for use on the battlefield during the daytime, but also employ a distinctive appearance that makes them difficult to detect with light amplification devices, such as night-vision goggles (NVGs). These modern "digital" print uniforms present a somewhat splotched appearance, generally of somewhat muted colours, that provide visual concealment in a variety of surroundings. The US Army now issues, for all theatres of operations, the Army Combat Uniform, which replaces the Battle Dress Uniform and the Desert Combat Uniform. The colour scheme on these ACUs is a faded green/grey/tan pattern of random-appearing rectangular shapes. Pocket outlines on the front of the jackets are offset from vertical, so as to present a less distinctive straight line for the eye to follow while using NVGs. The U.S. Marine Corps also issues similar uniforms with their MARPAT pattern, the U.S. Marines considered adopting CADPAT for their new pattern, however, the Canadian government owns the copyright for the pattern which it had been developing since 1988. The Canadian government supplied information and manufacturers to help the Marines with the development of their own computer-generated digital pattern pixelated uniform. Though their uniforms are not designed to replace both woodland pattern uniforms and desert pattern, since both woodland digital and desert digital patterns are available. Similarly the US Air Force has begun fielding digital pattern uniforms to their service members, with those uniforms featuring a blue/grey/tan pattern). Uniform of the day The "uniform of the day," when referred to in a military sense, is the designated uniform all military personnel are required to wear on that particular day. It is often designated by the senior officer on the base. Normally the uniform is determined by the seasons (e.g. winter blues or summer whites for Navy) however, special occasions (e.g. visiting dignitaries) or weather changes may dictate changes to the uniform of the day. The uniform of the day instruction is broadcast over the 1MC at reveille on board U.S. Navy ships. Logistics Mass-produced uniforms are a good way to equip thousands of soldiers quickly and efficiently. Uniforms in standard sizes and designs are also easier to replace on campaign. As an example, English levies raised for service in Ireland or the