My husband is in Basic Military Training right now and I need to file his taxes for last year, should I file them jointly even though we were only married this year?

He won't be back before the filing deadline so I need to file his regardless and I'm not sure how to go about it. We got married January of this year, but do I need to say we were married last year in order to file jointly? Or should I create a Turbotax account for him and file separately?