Indian troops geared up in the extreme conditions of Siachen sector. The Indian Army controls the heights, holding on to the tactical advantage of high ground. The Pakistanis cannot get up to the glacier, while the Indians cannot come down. Presently India holds two-thirds of glacier and commands two of the three passes. Pakistan controls Gyong La pass that overlooks the Shyok and Nubra river Valley and India's access to Leh district. The Pakistanis can resupply most of their posts by road and pack mule. At their forward positions, some as high as 21,000 feet, the Indians must rely on helicopters.