Hello Mr. Khan. I am not familiar with the allowances they provide for military forces. Anyhow, you will be able to survive with this salary as you can rent form 3500 to 4400 an apartment and live with the rest. From my experience in such type of shared accommodation you don't have to pay electricity and water bills which will save you around 400 to 500 QAR. You can own a vehicle easily here either used or new. For daily living details, please check the link below. I hope this assists you in making a decision on your move.

http://www.expatarrivals.com/qatar/cost-of-living-in-qatar