They defo dont need army not cuz they are surrounded by india but cuz how willingly they have surrendered their country to india. India is so much controlling bd.TBH Bangladesh doesn't need an army at all. They are surrounded by India on all sides, how exactly will they defend from any threats?
If bd military really is of some use, then they kick haseena to india, catapult that thing to remotest indian corner free the country from indian hegemony and demolish farkka dam and run the coutnry normal way.