The Indian Army is the land-based branch and the largest component of the Indian Armed Forces. The President of India is the Supreme Commander of the Indian Army,[4] and its professional head is the Chief of Army Staff (COAS), who is a four-star general. Two officers have been conferred with the rank of field marshal, a five-star rank, which is a ceremonial position of great honour. The Indian Army originated from the armies of the East India Company, which eventually became the British Indian Army, and the armies of the princely states, which were merged into the national army after independence. The units and regiments of the Indian Army have diverse histories and have participated in a number of battles and campaigns around the world, earning many battle and theatre honours before and after Independence.[5] The primary mission of the Indian Army is to ensure national security and national unity, to defend the nation from external aggression and internal threats, and to maintain peace and security within its borders. It conducts humanitarian rescue operations during natural calamities and other disturbances, such as Operation Surya Hope, and can also be requisitioned by the government to cope with internal threats. It is a major component of national power, alongside the Indian Navy and the Indian Air Force.[6] The army has been involved in four wars with neighbouring Pakistan and one with China. Other major operations undertaken by the army include Operation Vijay, Operation Meghdoot, and Operation Cactus. The army has conducted large peace time exercises such as Operation Brasstacks and Exercise Shoorveer, and it has also been an active participant in numerous United Nations peacekeeping missions, including those in Cyprus, Lebanon, Congo, Angola, Cambodia, Vietnam, Namibia, El Salvador, Liberia, Mozambique, South Sudan, and Somalia. The Indian Army is operationally and geographically divided into seven commands, with the basic field formation being a division. Below the division level are permanent regiments that are responsible for their own recruiting and training. The army is an all-volunteer force and comprises more than 80% of the country's active defence personnel. It is the largest standing army in the world, with 1,237,117[7][8] active troops and 960,000 reserve troops.[9][10] The army has embarked on an infantry modernisation program known as Futuristic Infantry Soldier As a System (F-INSAS), and is also upgrading and acquiring new assets for its armoured, artillery, and aviation branches.[11][12][13] 1776, a Military Department was created within the government of the East India Company at Kolkata. Its main function was to record orders that were issued to the army by various departments of the East India Company for the territories under its control.[14] With the Charter Act of 1833, the Secretariat of the government of the East India Company was reorganised into four departments, including a Military Department. The army in the presidencies of Bengal, Bombay and Madras functioned as respective Presidency Armies until 1 April 1895, when they were unified into a single Indian Army.[15][16][17][18] For administrative convenience, it was divided into four commands, namely Punjab (including the North West Frontier), Bengal, Madras (including Burma), and Bombay (including Sind, Quetta and Aden).[19] The British Indian Army was a critical force for maintaining the primacy of the British Empire, both in India and throughout the world. Besides maintaining the internal security of the British Raj, the Army fought in many other theatres: the Anglo-Burmese Wars; the First and Second Anglo-Sikh wars; the First, Second, and Third Anglo-Afghan wars; the First and Second opium wars, and the Boxer Rebellion in China; and in Abyssinia. The Kitchener Reforms brought the British Army to a new century.[20] In the 20th century, the British Indian Army was a crucial adjunct to British forces in both world wars. 1.3 million Indian soldiers served in World War I (1914–1918) with the Allies, in which 74,187 Indian troops were killed or missing in action.[21] In 1915 there was a mutiny by Indian soldiers in Singapore. The United Kingdom made promises of self-governance to the Indian National Congress in return for its support but reneged on them after the war, following which the Indian Independence movement gained strength. The "Indianisation" of the British Indian Army began with the formation of the Prince of Wales Royal Indian Military College at Dehradun, in March 1912, with the purpose of providing education to the scions of aristocratic and well-to-do Indian families and to prepare selected Indian boys for admission into the Royal Military College, Sandhurst. Cadets were given a King's commission, after passing out, and were posted to one of the eight units selected for Indianisation.