Well, I know in Africa we do some farming over there. And that is mandatory to feed such a large population of Bangladesh in future generations.
Actually, a small country like Bangladesh doesn't even need a very big navy unlike the PLA or USN. Naval affairs are even more expensive and more complex than air force.
Off-topic:
The population growth in Bangladesh is the mother of all problems. If population keeps growing, room for improvements in HDI become slimmer.
Bottom line is, we don't necessarily need a big navy to project our power to the world. Israel is a good example of a small country, and yet formidable in pretty much everything. And their navy is very small.
We need to really prioritize population control. Especially in rural areas. Dhaka is becoming so congested, that it will become virtually inhabitable at some point in the future. A population of 160 million and growing is a huge burden. And most of the current population are unskilled/illiterate.
I have a strange feeling that great improvements and change such as population control, improvements in HDI, economic self-sufficiency and strength, etc. in Bangladesh in the current environment will take a very long time and for people to fully realize. Maybe we may not live to see it.
I find it miraculous that the country is still managing to hang on in everything, amid all the hurdles. It is a miracle.