Pakistan
The Pakistan Armed Forces are one of the largest active service forces in the world, with almost 617,000 full-time personnel, due to the complex and volatile nature of Pakistan's relationship with India and the Kashmir region, and its porous border with Afghanistan. An additional 513,000 part-time reservists (including armed civilians of FATA) can be activated in a few weeks as per the situation under the order of the President of Pakistan who is the Commander and Chief of the Armed Forces of Pakistan. This does not include the additional 427,627 troops of the Paramilitary who too are an active force whose full-time responsibility is to guard the sovereignty of the nation from internal and external threats.
Read more about this topic: Active Duty