How do I properly place full size medals on my ASU?

The Answers to your questions can be found in DA PAM 670-1. Please see the references below:

22–7. Full-sized U.S. and foreign decorations and service medals

1. Where worn. All personnel may wear full-sized decorations and service medals on the service/dress uniform.
2. How worn. Personnel wear all full-sized decorations, except the Medal of Honor (see para c, below) in the order of precedence from the wearer’s right to left, in one or more rows, with 1/8-inch space between rows. Second and subsequent rows will not contain more medals than the row below. Personnel will not wear service and training ribbons when full-sized decorations and service medals are worn. Personnel may wear U.S. and foreign unit award emblems as prescribed, when wearing full-sized medals. Full-sized medals are worn as follows:

(1) Males wear full-sized medals immediately above the left breast pocket, in as many rows as necessary. The number of medals worn in each row depends upon the size of the coat. Full-sized decorations or medals will not overlap within a row. When full-sized medals are worn, personnel may wear up to three combat and special skill badges or metal tab replicas (or a combination) from groups 1 through 5, but may only wear one combat or special skill badge from either group 1 or group 2 one above the other, above the medals, in order of group precedence. Males may not wear the driver and mechanic badges with full-sized medals, and they may not wear special skill and marksmanship badges on the pocket flap below the medals (see fig 22–4).

(2) Females wear full-sized medals centered on the left side of the coat. The bottom row of the medal pendants are positioned parallel to the bottom of the nameplate. Females may adjust the placement of the medals and nameplate to conform to individual body shape differences. The number of medals worn in each row depends upon the size of the coat. When full-sized medals are worn, personnel may wear up to three combat and special skill badges or metal tab replicas (or a combination) from groups 1 through 5, but may only wear one combat or special skill badge from either group 1 or group 2 one above the other, above the medals, in order of group precedence. Females may not wear the driver and mechanic badges with full-sized medals, and they may not wear special skill and marksmanship badges below the medals (see fig 22–5).

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