You need online consultation personally as we will need to discuss ur problems thoroughly to guide u properly for the best solutions.

Consult Psychiatrist and Deaddiction Centre.

Your dad is only 45 years old. So you should be about 15-20 years old. Very creditable that you are so concerned. Your father should consult a Psychiatrist who might  in help him for de-addiction.  But such things need strong willpower. Leaving service by being boarded out is not the answer. What will he do after leaving service? And he will not leave liquor either. So that's not the answer.

Tell your father that he can go in lower medical category for alcohol dependence syndrome in Army medical category .And then he will have to face invalidation medial board  ( boarded out of military service ) ,if don't improve this habit of drinking . I understood your concern  and noted the problem as well .I need to ask few more details to make a diagnosis and start treatment and advice which suits you. Pl consult me on Practo , so that I can help you better.book a time slot as per your convenience for consultation.

Psychiatrist and deaddiction centre

Would like to discuss in details and provide apt solution. Kindly consult.

Counsult psychiatrist and try contacting nearest de-addiction centre.

Pyschiatrist or de-addiction centre

Consultation in a deaddiction centre is advisable

Visit psychiatrist

Need doctors help or self dedication