I know. I was in the Army and they go off of your height, which is total bullshit. If you have lifted in the past and have some decent size, they say your overweight, but you BF % could be under 9%.
Back in those days I would just throw up the guns and say "Do you see any fucking fat? I max out all PT tests too you skinny bitches". Then the harassment stops. You need to do the same.
According to them I was supposed to be around 220 at 6'2, but I was around 240 then. I was in the best shape off my life but I was in the 82nd Airborne and we ran about 4 miles min. everyday. I loved to run, but I have had 2 knee surgerys that fucked that up. Precorp elliptical is the only way to go if you suffer from joint pain. I bought one of their home models and its a good investment.
A diet high in protien for me is best. Really and truly I just eat a ton of meat and veggies with the lower carb veggies in the evenings. I have one serving of oatmeal in the morning with either chopped banana or chopped strawberries. I still drink 3 protien shakes a day that are low in fat and carbs. Metabolic Drive from Biotest taste the best to me. I take animal paks everyday.
Creatine after workouts. I use Spike in the mornings with some coffee. I have also been using Carbolin 19 as reccomended.
Hope I helped and hang in there.