Service ribbons or ribbon bars are small ribbons mounted on small metal bars equipped with attaching devices, and are generally issued for wear in place of medals. Each country's government has its own rules on what ribbons can be worn in what circumstances, and in which order. This is usually defined in an official document and is called "the order of precedence" or "the order of wearing". In some countries (particularly the U.S.), some awards are "ribbon only", having no associated medal.
According to the Defense Logistics Agency (DLA), the U.S. military's standard size for a ribbon bar is 33.40mm wide, 3/8 inches tall , with a thickness of 0.8mm.
The service ribbon for a specific medal is usually identical to the suspension ribbon on the medal. For example, the suspension and service ribbon for the U.S. government's Purple Heart medal is purple with a white vertical stripe at each end (see Photo).
However, there are some military awards that do not have a suspension ribbon, but have an authorized ribbon and unit award emblem. The Soviet Order of Victory is a badge that was worn on the military parade uniform. However, a ribbon bar representing the Order of Victory was worn on a military field uniform.
There is a variety of constructions of service ribbons. In some countries, service ribbons are mounted on a "pin backing", which can be pushed through the fabric of a uniform and secured, with fasteners, on the inside edge. These ribbons can be individually secured and then lined up, or they can be all mounted on to a single fastener. After the Second World War, it was common for all ribbons to be mounted on a single metal bar and worn in a manner similar to a brooch. Other methods of wearing have included physically sewing each service ribbon onto the uniform garments.
"Orders of wearing" define which ribbons may be worn on which types of uniform in which positions under which circumstances. For example, miniature medals on dinner dress, full medals on parade dress, ribbons on dress shirts, but no decorations on combat dress and working clothing. Some countries (such as Cuba) maintain a standard practice of wearing full service ribbons on combat utility clothing. Others strictly prohibit this. These regulations are generally similar to the regulations regarding display of rank insignia, and regulations regarding saluting of more senior ranks. The reasoning for such regulations is due to these displays enable opposing forces to easily identify persons of higher ranking, and therefor aiding them in choosing targets which will have a larger impact on the battlefield. In times of war, it is not uncommon for commanders and other high value individuals to wear no markings on their uniforms, and wear clothing and insignia of a lower ranking soldier.