Check the regs. When I was in, you could receive the bib on for accumulated time from short deployments, with a day in the first and last month covering the full month, e.g. depending upon the start day 60 days could equal 3 months
There are several ways to earn the OSR without completing a 12 month tour. Only the personalist can check the records to see if you qualified. At one time I had 3 OSR last week it dropped to 1 when I had to validate my ORB. I has 3 for the last 12 years. It’s all a mystery.