Not in the Dominican Republic, but on the otherside of the island in Haiti, yellow, or rather, mustard yellow, is the traditional color of the Haitian army.
The barracks used to all be painted mustard yellow.
When Aristide was returned to power in 1994, he did away with the Haitian army and ordered that the barracks be repainted white, a symbolic break with the(The Duvalier) past.