wife's mentally and economically torcher

Maintenance to wife, you will have to pay. The Army authorities will seek your opinion about the maintenance application of your wife made to them about which you can always show then District & Session Civil Court order of the amount of maintenance allowed to her, this will help you to get rid of the Army maintenance order, that usually is 25 % of the Salary being deducted and sent to wife of the Army staff directly to her bank account.

The best course to get rid of such troublsome wife is seeking divorce from her on the ground of cruelty and mental harasment if you have sufficient evidence to prove this in the Family Court.

also note that AWWA is no authrotiy to decide maintenacne.  It is not even organ of Govt of India.

Further you are alsoready paying maitenace udner a court order.