For those medals which are common to the services, the order of precedence is the same. However, service-specific medals can violate the general order of precedence, though usually the service-specific ones at the higher levels (e.g. DSC, Navy Cross, and AF Cross) would usually fit right into the other services' orders of precedence at the same level. Another problem is that some unit level awards (e.g. Joint Meritorious Unit Award) are worn on the right chest in some services, and on the left chest in other services-- thus, they will also violate the general order of precedence if worn on the left chest. Foster and Borts, in their book "A Complete Guide to All United States Military Medals, 1939 to Present" give a good overview of this, and provide complete charts of precedence for each service.