Question: Alfred Shepherd was posted to the squadron first raised in what year?

Context paragraphs:
Peter Turnbull (RAAF officer): Peter St George Bruce Turnbull, DFC (9 February 1917 – 27 August 1942) was an Australian fighter ace of World War II, credited with twelve aerial victories.  Born in Armidale, New South Wales, he was an electrician before he joined the Royal Australian Air Force (RAAF) in January 1939.  After pilot training he was posted to No. 3 Squadron, which departed for action in the Middle East in July 1940.  Flying Gloster Gladiator, Hawker Hurricane and P-40 Tomahawk fighters during the North African and Syria-Lebanon campaigns, Turnbull was credited with nine victories and awarded the Distinguished Flying Cross.  Posted to the South West Pacific in March 1942, he joined No. 75 Squadron at Port Moresby, New Guinea, operating P-40 Kittyhawks.  During the ensuing Battle of Port Moresby, he claimed three Japanese aircraft.  Turnbull took over command of No. 76 Squadron in May, leading it into the Battle of Milne Bay later that year.  He was killed during a mission on 27 August 1942; an Allied airfield in New Guinea was subsequently named for him.

No. 116 Squadron RAF: No. 116 Squadron RAF was a Royal Air Force squadron first formed as part of the Royal Flying Corps during World War I. Reformed as part of the RAF during World War II it served as an anti-aircraft calibration unit and also operated post-war from 1952 until 1958.

131 Commando Squadron Royal Engineers: 131 Commando Squadron Royal Engineers is an Army Reserve unit, and part of 24 Commando Regiment Royal Engineers.  It provides engineering support to 3 Commando Brigade Royal Marines (3 Cdo Bde RM) and is the largest Army Reserve Commando unit.  The squadron has deployed worldwide to provide combat engineer support to 3 Cdo Bde RM, often deploying in small sub-units.  131 was first raised in 1947 as an airborne engineer regiment, and reached a strength of over 1,000 trained parachute engineers by the early 1960s.  Between 1 April 1978 and 1 October 2015, the unit was an independent Commando squadron under operational command of HQ 3 Cdo Bde RM.  On 2 October 2015, it formally became the third squadron of 24 Commando Engineer Regiment.

723 Squadron RAN: 723 Squadron is a Royal Australian Navy Fleet Air Arm squadron.  The squadron was first raised in 1952 and throughout its history has served operationally during the Vietnam War, the Gulf War and in East Timor.  It currently operates as a helicopter training squadron and is based at HMAS Albatross at Nowra, New South Wales.

No. 29 Squadron RAF: No. 29 Squadron of the Royal Air Force was first raised as a unit of the Royal Flying Corps in 1915, and is one of the world's oldest fighter squadrons.  The second British squadron to receive the Eurofighter Typhoon, it is currently the Operational Conversion Unit (OCU) for the Typhoon.

824 Naval Air Squadron: 824 Naval Air Squadron is a Royal Navy Fleet Air Arm squadron first formed on 3 April 1933, disbanding and reforming several times before assuming its current role at RNAS Culdrose as a training squadron.

Leicestershire Yeomanry: The Leicestershire Yeomanry (Prince Albert's Own) was a yeomanry regiment of the British Army, first raised in 1794 and again in 1803, which provided cavalry and mounted infantry in the Second Boer War and the First World War and provided two field artillery regiments of the Royal Artillery in the Second World War, before being amalgamated with the Derbyshire Yeomanry into forming the Leicestershire and Derbyshire (Prince Albert's Own) Yeomanry in 1957.  The regiment's lineage is currently perpetuated by B (LDY) Squadron of the Royal Yeomanry.

Alfred Shepherd: Alfred Seymour Shepherd, DSO, MC (13 April 1893 – 13 July 1917) was an Australian fighter ace of World War I.  He was credited with ten aerial victories.  A civil engineer by profession, he enlisted in the Australian Imperial Force in 1915, and served with infantry battalions in France.  He transferred to the Royal Flying Corps in 1916 and was posted to No. 29 Squadron, operating Nieuport fighters.  After barely two months at the front, during which his victories earned him the Military Cross and the Distinguished Service Order, he was shot down and killed by a German ace in July 1917.  He was buried in France.

Chasseurs d'Afrique: The Chasseurs d'Afrique were a light cavalry corps of chasseurs in the French Armée d'Afrique (Army of Africa).  First raised in the 1830s from regular French cavalry posted to Algeria, they numbered five regiments by World War II.  For most of their history they were recruited from either French volunteers or French settlers in North Africa doing their military service.  As such they were the mounted equivalent of the French Zouave infantry.  The other major cavalry element in the Armee d'Afrique were the Spahis—recruited from the indigenous peoples of Algeria, Tunisia, and Morocco with mostly French officers.

Dave Shannon: David John (Dave) Shannon, DSO & Bar, DFC & Bar (27 May 1922 – 8 April 1993) was an Australian bomber pilot of World War II, best known for his part in the "Dambusters" raid on the night of 16/17 May 1943.  Born in South Australia, he joined the Royal Australian Air Force (RAAF) in 1941 and learned to fly under the Empire Air Training Scheme.  After further training in the United Kingdom he was posted to No. 106 Squadron RAF, operating Avro Lancaster heavy bombers, and was awarded the Distinguished Flying Cross (DFC) in January 1943.  In March he was selected by No. 106 Squadron's commanding officer, Wing Commander Guy Gibson, to join the newly formed No. 617 Squadron for Operation Chastise, the attack on the dams of the Ruhr valley.  Awarded the Distinguished Service Order (DSO) following the raid, Shannon continued to fly with No. 617 Squadron until October 1944, during which time he earned bars to his DSO and DFC.  He was then assigned to transport duties, first with No. 511 Squadron and then, in March 1945, with No. 246 Squadron.  Ranked squadron leader, Shannon was demobilised after the war and remained in England, becoming an executive with Shell.  He died in South London in 1993, aged seventy.

Supporting paragraphs: Alfred Shepherd No. 29 Squadron RAF
Answer: 1915