Question: Depinder Singh was an assistant to the Chief of the Army Staff who had servied in what force during World War II?
Context: Major General Janak Singh (surname Katoch) CIE, OBI, ( 7 Aug 1872 – 15 Mar 1972) hailed from Village Khaira, District Kangra in the present day State of Himachal Pradesh in India.  He was Army Minister and later Revenue minister in the government of Maharaja Hari Singh of Jammu and Kashmir State.  On 10 Aug 1947 he was brought out of retirement to be the Prime Minister at a turbulent time on the eve of the independence of India and Pakistan.  He steered the Standstill Agreement that Kashmir State wanted to sign with India and Pakistan.  The agreement was not signed by India, before further deliberations were done Pakistan assisted raiders had marched into Kashmir state.  Maj Gen Janak Singh asked to be relieved and was replaced by Mehr Chand Mahajan on 15 Oct 1947. On 13 September 1947 Maharaja Hari Singh had requested for loan of the services of Lt. Col. Kashmir Singh Katoch (son of Major-General Janak Singh) of the Indian Army to act as the Military Adviser to the Maharaja.  This request was granted by the Indian government.  Lt Col Kashmir Singh Katoch was the eldest of the three sons of Major General Janak Singh.  He had won a Military Cross with a unit of the Frontier Force Rifles during World War II in action in Italy.  He ultimately retired as a Lt General in the Indian Army.  The other two sons also served in the Indian Army, one in the 5 Gorkha Rifles Brigadier Devendra Singh Katoch, AVSM and the youngest Lt Colonel Rajendra Singh Katoch followed his father into the J&K State forces where he was commissioned into the J&K Bodyguard Cavalry. The British Vice-Chief of the Air Staff (VCAS) was the post occupied by the senior Royal Air Force officer who served as a senior assistant to the Chief of the Air Staff.  The post was created during World War II on 22 April 1940 and its incumbent sat on the Air Council.  It was abolished in 1985 when the post's responsibilities were combined with those of the Assistant Chief of the Air Staff (Policy) and the Assistant Chief of the Air Staff (Operations) to create a single post, the Assistant Chief of the Air Staff. Lieutenant general Depinder Singh (born 1930, Punjab British India) was the Overall commander of the IPKF in Sri Lanka from July 1987 to March 1990,He was the military assistant to Sam Manekshaw from 1969-73 during the Indo-Pakistani War of 1971. William Robertson Desobry (September 11, 1918 – January 12, 1996) was a senior U.S. Army field commander in Germany during the Cold War, and a Lieutenant General in the United States Army.  General Desobry was a decorated hero from World War II, and played a significant role as an advisor to the Republic of Vietnam Army and on the Army Staff during the Vietnam War.  In addition to commanding a division and corps, he was the Commanding General of the Armor Center and was the President of the XM-1 Tank Task Force. Field Marshal Sam Hormusji Framji Jamshedji Manekshaw, MC (3 April 1914 – 27 June 2008), popularly known as Sam Bahadur ("Sam the Brave"), was the Chief of the Army Staff of the Indian Army during the Indo-Pakistani War of 1971, and was subsequently the first Indian Army officer to be promoted to the rank of field marshal.  His distinguished military career spanned four decades and five wars, beginning with service in the British Indian Army in World War II. Lieutenant-General Sir Louis Ridley Vaughan, KCB, KBE, DSO (7 August 1875 – 7 December 1942), was a British Indian Army staff officer and First World War general.  During the First World War, he served on the Western Front, and was chief of staff to General Sir Julian Byng, commander of the Third Army from May 1917 until the end of the war.  After the war, he served in the Third Anglo-Afghan War of 1919, and then held several army positions in India until his retirement in 1928.  He died in 1942 at the age of 67. General Gopal Gurunath Bewoor, Padma Bhushan, PVSM (11 August 1916 – 24 October 1989) was an officer of the Indian Army who served as the 9th Chief of Army Staff.  In a long service spanning four decades, Gen. Bewoor saw action during World War II and later was involved in Indian Army operations during the 1965 as well as 1971 Indo-Pakistani war.  He succeeded Field Marshal Sam Manekshaw as the Army chief in January 1973 and following his retirement from the army, served as the Indian Ambassador to Denmark till 1979.  He was a recipient of the third highest Indian civilian honour of the Padma Bhushan. Brigadier-General Philip Howell, CMG (7 December 1877 - 7 October 1916) was a senior British Army staff officer during World War I.  He was, successively, Brigadier-General, General Staff (BGGS) to the Cavalry Corps under General Allenby (1915), and then BGGS to X Corps under Lt. General Morland (1915).  In October1915 he was posted as Chief of Staff (BGGS) to the British Salonika Army under Lt. General Mahon, before appointment as Chief of Staff (BGGS) and second-in-command to II Corps under Lt. General Jacob, forming part of General Gough's "Reserve Army" (Fifth Army) at the Battle of Somme in 1916.  Howell was killed in action at Authuille by shrapnel on 7 October 1916, after making a personal reconnaissance of the front line near Thiepval during the later Somme offensives.  Howell had been in action on the front line since the start of World War I, serving with the BEF, and commanding the 4th Queen's Own Hussars as Lt. Colonel through The Retreat from Mons, The Battle of Le Cateau, The Marne offensive, Hill 60, and the First Battle of Ypres.  He was mentioned in dispatches six times, and made a Companion of the Order of St. Michael and St. George(CMG) in 1915, for "meritorious service". Lieutenant Colonel (Retd.)  Jaswant Singh Marwah (born 21 January 1921) is an Indian soldier, journalist and author, and the father of General Joginder Jaswant Singh, the first Sikh Chief of Army Staff of the Indian Army.  He was a former Special Duty Officer in the Archaeological Survey of India, and served in the Indian Army's Electrical Mechanical Engineering branch from 1943 to 1973.  He is also a veteran of the Second World War.  He was awarded the Nehru Award in 1981 and 1984, by the Vice President of India and the President of India respectively.  In 1987 he was awarded the Journalism Award by the Indian Ministry of Communications. Vilmos Rőder (11 January 1881 – 13 December 1969) was a Hungarian military officer and politician, who served as Minister of Defence between 1936 and 1938.  He fought in the First World War as Chief of Army Staff of Army Corps.  He was the triggering of the army development between 1930 and 1934, but he had a conflict with Prime Minister Gyula Gömbös in connection with these plans, that's why he retired.  Later the new Prime Minister Kálmán Darányi appointed him as Minister of Defence.  He participated in the planning of the Program of Győr.  Rőder resigned along with the other members of the cabinet in 1938.  Following this he joined to the group of István Bethlen, which opposed entering World War II.
Answer: British Indian Army