AR 670-1, para. 29-16a(2)
Remove when they "fail to qualify or are exempt from qualification by Army regulations."
The correct order for the three badges are follows: Parachutist, Drivers and Marksmanship. All badges are 1/8" from the top of the pocket with equal distance between the three badges. Ref: Army Regulations 670-1. Parachutist (Group 4), Drivers (Group 5), and Marksmanship.
The US Army is presently going to dress blues.
CIB is worn cetered, 1/8" above ribbons. The other 3 are worn in the exact sequence you mentioned, centered BELOW the ribbons. See 670-1 for a more detailed description.
On the left lapel of the wearer.
The short answer: With a few exceptions, almost any award or badge that can be worn on the Army Class A "greens" may be worn on dress blues. On the Army male Dress Blue Uniform one may wear ribbons, full-sized medals, or miniature medals over the left breast pocket. However the miniature medals may only be worn with a bow tie. Special skill (such as airborne wings) and marksmanship badges are also worn on the left side above or below ribbons, though when wearing fullsize medals on dress blues drivers and mechanics badges may not be worn nor may any special skills badges or marksman ship badges be worn beneath full-size medals on the pocket flap of Army male dress blues. For the full answer see Army Regulation 670-1 for wear of uniforms Chapter 20 is male dress blue uniform and chapter 21 is for females. AR 670-1 is available as PDF here: www.army.mil/usapa/epubs/pdf/r670_1.pdf also as HTML here: http://www.marlowwhite.com/army-AR-670-1-view.html
The length of a dollar bill will be close.
On the left side of your dress uniform for the Army. Usually below the other badges if you have room. Navy, Marines, Airforce will wear ribbons of the left side of the dress uniform. Ferguson
I am guessing around 1900 http://members.tripod.com/~Fbg_mem_museum/uniftalk/unipat2.htm
Per ALARACT 203/2010, the CSIB is now authorized as optional wear for the Army Blue Mess and Army White Mess dress uniforms.
The badges of the United States Army are categorized into marksmanship, combat and special skill, identification and foreign. These categories can also be divided into different groups. Some badges are Special Forces Tab or Drill Sergeant Identification Badge.
AR 670-1 Wear and Appearance of Army Uniforms That will cover everything from greens, acus, whites, blues, how long side burns should be and what gloves go where and when.
The unit crest is worn on the epalette of the dress green uniform,all nco's wear a green cloth secured to the epalette and the unit crest is placed upon the same...