The State of Bangladesh officially came into existance in 1971 but Bangladeshis fought durring both the first and second world wars, against germany and japan Just as many pakistanis have. British India that fought in the great wars was divided into 2 countries, the indian republic and pakistan (that latter was divided into pakistan and Bangladesh).
The republic of india does not represent my grandfathers contribution to the wars, and as such we have as much right to participate in commemerations as does india. In short indian republic does not represent south asia, it ONLY reprsents indians.