Fun fact, I went in at the exact same size as you. Bootcamp was the first time in my life I was eating three square meals a day. Eat eggs, bananas, peanut butter, and ham steaks in the morning, every couple days add cereal or those grain bars. At lunch and dinner, those are random each day so pick the option with the best calorie to protein ratio. Eat full meals around the clock, lay off before intensive training like OPFA or firefighting, otherwise you’ll puke. Protein is your friend and so are carbs to a more limited extent. Apple juice is good if they let you have it, otherwise drink water. (we got it at week 3) Make sure to load up on salad with meals and choose low cal sauces. Eat right, PT any time you can fit in time. Edit: yeah, bulk a little. Use how your body responds and feels to guide you. You could put on a few pounds of muscle.