Military Press (AKA Military Creases) is the style of ironing (pressing) the Uniform Shirt. The process is done by first properly ironing the entire shirt, then folding along the crease lines, and finally pressing and starching each line into place. A crease is to be made on the front from top to bottom down through the center of each breast pocket. Three more creases are to be ironed into the back starting below the lower stitch marking the bottom of the should section. These creases are to be left, right, and center much like the front.
The process requires time and skill so most have their uniform shirts dry-cleaned professionally. Most laundromats know what military press and can do it for you if you ask.
In the past, some scouts have sown permanent creases into the uniform. This is clever and funny but it is not correct. Please do not do it.