Colors Halt Procedures
After HALT is commanded, execute the additional step required after the command
bring the heels together sharply on line, with the toes pointing out equally, forming a 45-degree angle. Rest the weight of the body evenly on the heels and balls of both feet. Keep the legs straight without locking the knees. Hold the body erect with the hips level, chest lifted and arched, and the shoulders square. Keep the head erect and face straight to the front with the chin drawn in so that alignment of the head and neck is vertical.
Place the butt of the rifle on the marching surface, centered on the right foot, with sights to the rear. The toe of the butt touches the foot so that the rear sight and pistol grip form a straight line to the front.
Secure the rifle with the right hand in a “U” formed by the fingers (extended and joined) and thumb.
Hold the rifle above the front sight assembly with the right thumb and forefinger pointed downward, and on line with the flat surface of the handguard. Keep the right hand and arm behind the rifle so that the thumb is straight along the seam of the trouser leg.
Video:
http://www.pdf-archive.com/2014/01/22/army-tc-3-21-5/army-tc-3-21-5.pdf
Page: 4-8, 5-2, 5-3