During the Civil War, Union soldiers wore blue uniforms and were thus Blue Bellies by the Confederate soldiers.
The Yankees
Gray was Confederates Navy blue was Union Soldiers
blue helmets
blue
Soldiers working under a UN mission wear a blue beret or helmet. They technically aren't UN soldiers. They remain soldiers for the country they come from.
In honor of Napoleon whose soldiers wore blue uniforms
blue
Union soldiers are identified by their blue uniforms with distinctive brass buttons, wearing the famous Union Army kepi hats. They also carry rifles and may have a Union flag in their vicinity.
The "Blue Helmets" are UN peacekeepers. They are also called "Blue Berets" due to their blue headgear. These individuals can be cops, civilians, or soldiers.
that was the color of the American soldiers prior to the civil war
The Union wore blue.