Army Officer Selection Board

Army Officer Selection Board (AOSB) is an assessment centre used by the British Army as part of the officer selection process for the regular army and Army Reserve and related scholarship schemes. The board is based at Leighton House, Westbury in Wiltshire, England in a dedicated camp. It is commanded by the President AOSB, a colonel in the British Army, supported by a number of vice-presidents.

AOSB is an equivalent of the Navy's Admiralty Interview Board and the Officer and Aircrew Selection Centre of the Royal Air Force.

History

The AOSB has its roots in the War Office Selection Boards (WOSBs), created by Army psychiatrists in 1942 during World War II. They involved candidates taking a three-day stay in a country house, where tests were administered including written tests of mental ability, questionnaires, leaderless group tests and interviews. Psychiatrists and some psychological components of the WOSBs were removed from the Boards after the war. The Army Officer Selection Board was known as the Regular Commissions Board (RCB). In 1949, the RCB moved from Sussex to its current facilities at Leighton House in Westbury, Wiltshire. By 2009, both Regular and Army Reserve officers were screened here.

Application process Applicants for the British Army undergo initial suitability assessments, through computer-based tests and interviews, along a number of routes. All officer candidates will be required to attend AOSB at a point determined by the type of entry. Candidates for scholarship and professionally qualified officers will attend only one board; other entrants will be required to attend both a briefing board and a main board.

Candidates will usually have undertaken insight or familiarisation visits to appropriate units prior to attendance at the board.

Board structure

Candidates are divided into groups of six to eight, each supervised by a group leader who is a major or captain and who runs the activities and records evidence.

A board consists of one or two groups and is presided over by a president or vice-president, with Professionally Qualified Officer boards supervised by an officer of the appropriate specialisation. Each group is assessed by a deputy president, who is a lieutenant colonel; their group leader; and an education advisor, who is a serving or retired officer of the AGC (ETS).

Up to three boards can be run concurrently.

Types of board

AOSB briefing This takes place over two days and must be attended prior to being able to proceed to the main board. It is an opportunity for candidates to learn some of the techniques that will be tested at the main board, and for the AOSB assessors to offer advice and guidance to those attending about how prepared they are to attempt the much more challenging main board. It is designed to give potential officers an idea of what is required and expected at the main board. Candidates will participate in a number of assessments, including physical and intellectual ones. The results will be used by AOSB assessors when feeding back to candidates.

After attending AOSB briefing, candidates will be assigned a category based on the evidence available to the assessors. This will be: Allowed to proceed to the main board as soon as desired. Required to delay for between 3 and 24 months (often awarded to younger candidates with potential ability but insufficient maturity, or for remedial purposes such as to improve upon physical fitness) The candidate is thought unlikely to pass the Main Board based on the evidence presented at briefing. However, they are not prevented from attempting the Main Board if, after further consideration, they believe they can achieve the required standard. The candidate is not considered suitable for commissioned service based on the evidence available. This may be as a result of a number of issues, including their personality or their ability to apply their intellect. Candidates who receive a Category 4 at the briefing may appeal against this result if they believe that their performance was not representative. If successful (strong cases must be made) the candidate may be allowed to attend a Main Board.

AOSB main board

This is a four-day selection event that consists of a number of different but inter-linked intellectual, physical, mental and aptitude tests. It is designed to put candidates for both the Regular Army and Army Reserve under pressure whilst fostering their team spirit and competitiveness.

The Boards normally run from Tuesday until Friday but a small number each year take place from Thursday until Sunday.

On arrival, candidates are allocated a number (used instead of their name) and placed into groups. As candidates are assessed against a standard and not against each other's performance, strong groups may see a large proportion of their members meet the standard.

On the last night of the course a formal dinner is held for the candidates. The staff are at pains to point out that the meal is not an assessment, and no directing staff are present at the event.

The details of the physical tasks, command tasks, interviews and academic tests are not made public. It is known that the assessment consists of a physical fitness assessment, an individual obstacle course, two multiple-choice tests on current affairs and general knowledge (in the past a third test covered military knowledge), three interviews, a group discussion and essay on current and moral affairs, a 5-minute lecture, individual planning exercise, and both leaderless team tasks and a series of command tasks where a team member commands the rest. There are also group races where each group gets an opportunity to test themselves against the other groups undergoing selection at the time.

Candidates are only permitted to make two attempts to pass the board, which must be separated by a minimum of eight months.

Chaplains Selection for Army chaplains – including regular, reserve, and cadet force roles – takes place at the AOSB.

CFCB (Cadet Forces) Board The Cadet Forces Commissions Board is used to select officers for the Army Cadet Force. Run over a weekend, the course is broadly similar to the AOSB Main Board, without physical tests. There is no set quota for selection and candidates are assessed against a standard, not each other.

Following completion of CFCB, a candidate is awarded one of four possible results:

Selected – The candidate has been successful at the board and is recommended for an Army Cadet Force commission. Not Selected (Encourage) – The candidate has not been successful, however it has been recognised that they have potential and are encouraged to attempt the board again at a later date. Not Selected – The candidate has not been successful. If they wish, they can attempt the board again at a later date. Not Selected (Discourage) – The candidate has not been successful and is deemed to be unsuitable for a commission. The candidate cannot normally attend for another attempt, however in extenuating circumstances their county commandant can appeal to the President CFCB for an exception to be made.

If a candidate has not been successful at the board, they must wait at least a year before a second attempt. If the second attempt is unsuccessful, they must wait a minimum of five years for a third attempt.

Army Scholarship Board The Army runs two Scholarship Boards each year for boys and girls aged between 16 and 17. The board is similar in many ways to the Main Board, with a fitness test, interviews, planning exercise and leadership tasks. The process takes 24 hours, and is tailored to suit candidates in this age range. The Board is designed to identify intelligence and leadership at a young age. Successful candidates are then subject to further scrutiny by Recruiting Group prior to potentially receiving a financial award whilst at sixth form, and then a subsequent annual award for each year whilst studying at university. They are also awarded a final lump sum on completion of the 44-week Commissioning Course after university. By passing the Board, scholars have a guaranteed place at Royal Military Academy Sandhurst, and they do not need to pass the AOSB Main Board to enter that establishment.

Physical fitness requirements Following the roll-out of new standardised fitness tests across the entire army in April 2019, the general fitness requirements for both regular and reserve officer entrants consists of the Role Fitness Test (Entry):

Reach 8.7 on a bleep test Throw a 4 kg medicine ball 3.1 metres from a seated position Lift 76 kg in a mid-thigh pull

Standards are the same for male and female candidates.

Presidents Major General V. H. B. Majendie, CB, DSO, 1943–1946 Major General Hubert Essame, CBE, DSO, MC, 1946–1948 Major General C. E. N. Lomax, CB, CBE, DSO, 1948–1949 Major General F. R. G. Matthews, CB, DSO, 1949–1950 Major-General F. W. Festing, GCB, KBE, DSO, DL, 1950–1951 Major General G. W. E. Heath, 1951–1954"Heath, Maj.-Gen. Gerard William Egerton", Who Was Who, online edition 1 December 2007 Major General B. A. Coad, CB, CBE, DSO, 1954–1956"Coad, Maj.-Gen. Basil Aubrey", Who Was Who online edition by Oxford University Press, 1 December 2007 Major General G. E. Prior-Palmer, CB, DSO, 1956–1957'PRIOR-PALMER, Maj.-Gen. George Erroll', Who Was Who 1971–1980 (London: A. & C. Black, 1989 reprint, ) Major General R. C. Cottrell-Hill, CB, CBE, DSO, MC, 1957–1959"Cottrell-Hill, Maj.-Gen. (retd) Robert Charles", Who Was Who, online edition 1 December 2007 Lt General Sir W. F. R. Turner, KBE, CB, DSO, 1959–1961 Major General R. G. S. Hobbs, CB, DSO, OBE, 1961–1962 Major General N. L. Foster, CB, DSO, 1962–1965 Major General Sir J. A. d'Avigdor-Goldsmid, Bart, CB, OBE, MC, Feb. 1965 – Sept. 1965 Major General R. E. T. St John, CB, MC, 1965–1967 Major General C. M. M. Man, CB, OBE, MC, 1967–1969 Major General D. L. Lloyd Owen, CB, DSO, OBE, MC, 1969–1972 Major General D. A. D. J. Bethell, 1972–1975 Major General A. G. C. Jones, CB, MC, 1975–1978"Jones, Maj.-Gen. Anthony George Clifford", Who Was Who, online edition 1 December 2007 Major General D. Houston, 1980–1983 Major General P. M. Welsh, O.B.E., M.C., 1983–1985"Major General Peter Welsh" (obituary), The Times, 27 May 2011 Major General R. Benbow, CB, 1985–1987 Brigadier J. E. Killick, 1987–1988 Brigadier M. R. Lee, 1988–1989 Brigadier A. B. S. H. Gooch, 1989–1992 Brigadier C. T. J. Wright, 1992–1993 Brigadier R. V. Searby, 1993–1996"Major General Robin Searby", HAWKI, accessed 27 March 2026 Brigadier S. H. R. H. Monro, 1996–1998 Brigadier D. A. K. Biggart, 1998–2000 Brigadier J. P. Hoskinson, 2000–2002 Brigadier S. R. B. Allen, 2002–2005"INTERVIEW WITH BRIGADIER SIMON ALLEN AT WESTBURY, 17 JULY 2003", Imperial War Museum, accessed 27 March 2026 Brigadier R. P. D. Folkes, 2005–2007 Brigadier P. J. Mostyn, 2007–2010 Brigadier Simon Caraffi, 2010–2012"Army Commands", Gulabin, accessed 27 March 2026 Colonel L. M. Giles, CBE, 2019–2022"Colonel Lucy Giles", Sexey's School, accessed 27 March 2026"President AOSB Lucy Giles", Twitter, accessed 27 March 2026 Colonel Iain Moodie, 2022–2025"CDS DS Joins Forces with Army Officer Selection Board for New Award", CD SDS, 2024, accessed 27 March 2026 Colonel Mark Gidlow-Jackson, 2025–2026"Westbury Festival donates funds to Army charity", White Horse News, 22 October 2025, accessed 27 March 2026

Leighton House

The estate on which Leighton House stands belonged to the Phipps family, a prominent family of Westbury clothiers, later landed gentry, who first leased a house there in the early 18th century and bought the property from the Earl of Abingdon in 1791. In 1800 Thomas Henry Hele Phipps, father of coffee merchants and politicians John Lewis and Charles Paul Phipps, built a new neoclassical box house, naming it Leighton House.