You might have read about indo-pak wars. There is a movie made over it. Its funny coz, the movie 'border' is made for the tribute of pakistan valour in longewala battle. The pakistani men in khakis are infact indian soldiers and indian men in dark green are infact pakistani soldiers. In real war too like kargil war of 1996, many indian army men had desserted indian army and sought refuge over kargil hills. So after truce, many pakistani army men dressed as indian soldiers came to meet indian army.