<p>Your health and weight will be closely monitored during BCT. If your SMO (safety/medical officer) believes you need to gain weight, you’ll be given cans of Ensure every night. Whatever you weigh when you enter, you’ll be taken care of.</p>
<p>I was a cross country guy in HS too. I inprocessed at 141, I believe (I’m about 5’10"). I think I was at 142 at the end of 1st BCT and around 145 at Acceptance Day. You’ll be fed immense amounts of calories during BCT, so you’ll likely gain weight naturally then too (not to mention, of course, that you’ll be building muscle mass). I still weigh about 145 lbs today.</p>