So much men also no use. Of 1st importance is air superiority.
If we have that, we have won a large part of the battle. Next comes
to naval capabilities for open sea lanes.
But if you consider ICBMs, then equation changes. This is why
Singapore is so quick to liase with N. Korea when evidence of the
potential danger came about. You think the Singapore goverment
invited the N. Korea foreign minister just for talk-cock-sing-song.
Surely they must have made some contingent offer on table for
mutual non-agression.
Manpower is important, but this thread seemed to have
overemphasized on that. However, it is true with such a substantial
army (reserve or not) and having the adequate equipment, countries
(esp around the region) will not only think twice but thrice before
taking any action.