Brief Answer:
Increase in height is not possible at your age medically.

Detailed Answer:
Hi Sir,

I understand your query and concern.

Height can't be increased at this age as Ossification(fusion) of bones already occurs by this age.

Continue doing Stretch exercise under expert trainer guidance as it will increase the upper body segment to some extent.

Increase in weight can occur through high protein diet and multivitamins.

There is no medication for increasing in height at this age.

Do not worry as 5.6 is a fair height but I don't have any idea of army recruitment.

Post your further queries if any,

Thank you.

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Brief Answer:
Weight gaining measures suggested.

Detailed Answer:
Hello, Sir.

I interpreted your concern.

Let me suggest you weight gain tips.These will certainly help you to gain weight and look muscular.

Do not ever feel depressed.Always conserve your self esteem.

1. Whatever you’re eating now, you should probably double it. If you eat three meals a day, instead eat six. You need to be eating every 2-3 hours, and each meal needs to be the size of a normal meal. 500 extra calories a day = 1 extra pound gained per week. Whatever you’re eating now, add an additional 1000 calories (spread throughout the day), and you’ll put on 2 lbs a week..

2.You need to eat a good amount of calories (probably 3500+ per day) if you want to gain weight, but you want to make sure most of those calories are GOOD calories. Good, high-calorie dense foods include peanuts, peanut butter, raw oats, lean red meat, bagels, and dried fruit. The more of these you can include in your diet, the faster you'll see results.

3.Get more carbohydrate into your diet through cereal, rice, pasta, fruits, and vegetables to provide fuel for activity.Cut down on fat in the diet and increase the protein and carbohydrate.

Make sure you eat one apple, pomegranate and an egg daily.

4.In case you want to consume fat make sure you consume these- olive oil, safflower oil, coconut oil, and grapeseed oil; avocados, walnuts, almonds, flaxseeds.

5.Drink at least 15 glasses of water everyday-Water will help your body process the extra protein and calories you’re taking in. Drink several glasses with every meal to avoid getting dehydrated.

6.Exercise at Gym-Concentrate on complex, compound exercises that recruit as many muscles as possible: bench presses, dumbbell presses, squats, deadlifts, pull ups, chin ups, and dips.

Wherever you’re starting out, concentrate on being stronger each and every time you exercise. Push yourself, get stronger, lift more, and before you know it you’ll be ripped.

When exercising, keep your rest between sets to a minute or less, and don’t do more than 12 reps in a set.

Have a banana, a handful of dried fruit or a sports energy shake immediately after you work out.

Keep in mind that when you eat five meals a day, you are going to be putting on some fat along with your muscle. That’s okay! Figure out what your goal weight is, and then add another 5-10 lbs on top of it.

Once you get to that weight, you can cut back on the carbs in your diet, do more sprints, and keep exercising: you’ll shed the fat quickly.

7. It’s important to get eight to nine hours of sleep every night for maximum gains. If you are only getting six hours or less, you’re not going to get all the benefits of your exercising and diet.

8. Limit cardio sessions.

9.Consider hiring a personal trainer. Within a few sessions, you'll have a great idea of scheduling, form, intensity, and duration of workouts and excellent insight into tweaking your diet.

10.Ask your physician before taking any supplements, and see a doctor right away if you experience an injury during a workout.

Post your further queries if any.

Thank you.

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