Let me use statistics to illustrate this point:
http://www.imf.org/external/pubs/ft/weo/2013/02/weodata/weorept.aspx?sy=2003&ey=2013&scsm=1&ssd=1&sort=country&ds=.&br=1&pr1.x=34&pr1.y=9&c=513,534&s=NGDPD,GGX_NGDP&grp=0&a=
In 2003, BD had an economy of 55 billion dollars and total government spending was 14% of GDP. That means that
that the BD government spent 7.7 billion dollars in 2003
In 2013, BD had an economy of 140 billion dollars, actually it is really over 150 billion dollars when the 2005 base
year is taken into account, and total government spending is set to be 17% of GDP. That means that
the BD government should spent 24 billion dollars
You see, in a decade BD government spending has gone up by 200% or tripled.
In 2003, India had an economy of 620 billion dollars and total government spending was 29% of GDP. That means that that the Indian government spent 176 billion dollars in 2003
In 2013, India had an economy of 1760 billion dollars, and total government spending is set to be 28% of GDP. That means that that the Indian government should spent 448 billion dollars
You see, in a decade Indian government spending has gone up by 154%
So BD government has 200% more to spend and the Indian government has only 154% more to spend from 10 years ago. Even keeping the same proportion of government spending on defence, BD will gain relatively more than
India.
BD still is spending maybe 1/3rd less of it's GDP on defence as India does and so the scope is there for BD to rachet up military spending in the future more than India