Final answer:
The proper placement of ribbons on a service coat is typically above the left pocket, with the top edge of the ribbons aligned with the bottom edge of the pocket flap, in order of precedence.
Step-by-step explanation:
The proper placement of ribbons on a service coat can vary depending on the specific regulations of the organization or military branch. However, there are some general guidelines to follow. Typically, ribbons are placed in a row above the left pocket of the coat, with the top edge of the ribbons aligned with the bottom edge of the pocket flap. The ribbons should be arranged in order of precedence, with the highest ranking ribbon placed on the top left.