Years ago I started a new job in January, having a trip planned in May for my sister’s graduation. At the interview I told them about the vacation. When I was being hired I told them about the vacation. When I completed training I told them about the vacation. Never was it an issue, until the week before vacation and they called mandatory overtime and said I could not go. I told managed they could reimburse me for the entire trip, or give me time off. They chose neither, I still went.