4. IndiaThe Indian Army dates back to the Stone Age. Today, it is known as being the largest all volunteer ground force in the world with more than 1,000,000 active duty soldiers.
India has never had to institute a draft to staff its ground force. The Indian Army has been involved in both world wars as well as several conflicts to fight for its own independence.
Pakistan has been its target on more than one occasion in its military history.
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