Is it to soon

My boyfriend (19) and I (17) have been together for close to two years and about a year ago he left for the military and I plan on joining the military in December when I turn 18 and if your married In the military they will keep you at the same base we each know each others parents and our families are all close and I know one day I want to marry him but now we are thinking we should marry when I graduate in May is it to soon