Final answer:
Military and organizational protocols usually require ribbons to be worn with a service coat during formal events. The exact requirements depend on the specific branch's uniform regulations.
Step-by-step explanation:
When it comes to wearing a service coat, regulations can vary by the specific branch of the military or organizational protocol. However, generally speaking, when a service uniform is worn, it often requires the appropriate ribbons and decorations to be displayed, particularly during formal events or situations where full dress is expected.
The passage you provided depicts a nurse in a military uniform, which suggests a formal or semi-formal setting, often requiring full regalia, including ribbons if that aligns with the uniform regulations of her service branch. It is essential to consult the specific uniform regulations for her service branch to determine the exact requirements for ribbon wear with a service coat.