I think he would’ve held out hope that she wasn’t dead, especially if her body was never found and he knew about her powers.<br/><br/>So, the timeline would work like this?  At 16, Cam and Sam met, most likely during Sam’s first day at Meteor City High (or whatever their high school is called).  They became friends.  One year later at 17, Cam finds out about Sam’s powers and decides to reveal his own powers to her.  At 18, they graduate from high school and stay in touch for the next two years before Sam enlisted in the Marines.  Cam would later find out from Sam’s parents that she had been presumably killed in action.<br/>