Jackson attained
general officer status with promotion to acting
major general in May 1992, after holding only one post as a brigadier; in peacetime, senior officers are normally expected to have held two posts before promotion. He was appointed Director General Personal Services (Army) at the Ministry of Defence, reporting to the
Adjutant General. He was granted the substantive rank of major general in June 1992, with his promotion backdated to October 1991. After two years at the MoD, Jackson took command of the
3rd Mechanised Division in April 1994. During the
Yugoslav Wars in 1995, Jackson had been due to succeed
Rupert Smith as commander of the
United Nations Protection Force (UNPROFOR), which would have entailed early promotion to
lieutenant general (
three-star rank) and a blue beret, signifying
UN command. As a result of the
Dayton Agreement, however, UNPROFOR became the
NATO-led
Implementation Force (IFOR), and Jackson remained a major general (
two-star rank), commanding the 3rd Division and troops from several other countries who made up
Multinational Division South-West. He was appointed
Companion of the Order of the Bath (CB) in November 1996. After he was appointed Commander of NATO's
Allied Rapid Reaction Corps (ARRC), Jackson was promoted to acting lieutenant general in January 1997, a rank he was granted substantively in April 1997. Jackson served in the NATO chain of command, reporting to the
Supreme Allied Commander Europe, American
four-star General Wesley Clark. Under Jackson's command, the ARRC deployed to
Bosnia and Herzegovina in March 1999, In one heated discussion with Clark, Jackson reputedly told him "I'm not going to start the
Third World War for you". He later told the
BBC he believed that obeying the order would have led to the possibility of an armed confrontation with Russian troops, which he felt was not "the right way to start off a relationship with Russians". pistol presented to Jackson by Bosnian Serb general
Momir Talić when commanding British troops in the ex-Yugoslavian theatre in the late 1990s. On display at the Parachute Regiment exhibition of the Imperial War Museum in Duxford. As a result of the incident at Pristina Airport, Jackson was dubbed "Macho Jacko" by the British press. Following the confrontation with Clark, Jackson went to the airport to meet
Viktor Zavarzin, the Russian general leading the detachment, and established a working relationship with him. Jackson, who was fond of whisky and cigars, and was awarded the
Distinguished Service Order (DSO) in 1999 for his leadership in Kosovo. Upon his return to the British chain of command in early 2000, he assumed the position of
Commander-in-Chief, Land Command, the second-highest position in the British Army, and a post which entailed promotion to full
general and membership of the
Army Board. As Commander-in-Chief, Jackson was responsible for assembling forces for the 2000 British
intervention in Sierra Leone, which included Brigadier
David Richards—later
Chief of the Defence Staff—and Jackson's son Mark. He also handled requests from the civilian authorities for assistance with the
foot-and-mouth disease crisis, floods and strikes
by firefighters and fuel tanker drivers. While still Commander-in-Chief, he stood in for the Chief of the General Staff, marching behind the coffin at the state funeral of
Queen Elizabeth The Queen Mother, in 2002. At the time of the
11 September 2001 attacks, Jackson was on a visit to the British
training facility in Alberta, Canada. He managed to return to the UK the next day aboard a casualty evacuation aircraft and had overall responsibility for force generation for the British Army's contribution to the subsequent wars in
Afghanistan and
Iraq.
Chief of the General Staff officer at
the Cenotaph in London on
Remembrance Day 2003|alt=Two men in military uniforms—one blue and one green—standing in front of a stone monument Jackson succeeded General Sir
Michael Walker as
Chief of the General Staff (CGS)—the professional head of, and highest post in, the British Army—on 1 February 2003, just over a month before the
2003 invasion of Iraq. He later said that he "did his homework" in researching the
disputed legality of the war and had convinced himself that the invasion was legal. Weeks after becoming CGS, Jackson was summoned to give evidence before the
Bloody Sunday Inquiry. Jackson insisted that the change was necessary to give the Army greater flexibility and capability, but said he was "acutely aware that this will be sad and unwelcome news for at least some of the infantry". As part of the same review, the
arms plot system, which kept infantry units moving around every few years, was also phased out as being inefficient. During the
Iraq War Jackson admitted that the war was putting the service under strain, but called the claim that the Army was "at breaking point", "nonsense". His investiture took place immediately after the awarding of the
Victoria Cross to
Johnson Beharry, as the VC takes precedence over all other awards. Speaking of Beharry's award, Jackson said he had "never felt more proud of the British Army", and following the investiture said that he was "overshadowed" by Beharry, "and quite rightly so—it was an honour to stand alongside him". He was present at the 2006 Sovereign's Parade at
RMA Sandhurst, in which
Prince Harry was commissioned—the first
Sovereign's Parade to be attended by Elizabeth II in 15 years. One of the most high-profile British Army generals since the Second World War, which he relinquished in 1999. In 1998 he was appointed
Colonel Commandant of the Parachute Regiment, until he was relieved by
Sir John Reith in 2004, and Colonel Commandant,
Adjutant General's Corps, succeeding Sir
Jeremy Mackenzie, until he was relieved by Sir
Freddie Viggers in 2005. He was appointed Honorary Colonel of the
Territorial Army's 2nd Battalion (Volunteers) The
Royal Gloucestershire, Berkshire and Wiltshire Regiment, in 1997. Following their amalgamation in the modernisation of the regimental structure, Jackson was appointed to the newly created position of Honorary Colonel, the
Rifle Volunteers, in 1999. He was given the title of
Aide de Camp General (ADC) to Queen Elizabeth II in 2001, succeeding Sir
Rupert Smith. He relinquished the appointment in 2006. After Jackson's retirement from the Army, he was appointed
Deputy Lieutenant of Wiltshire (DL) in 2007. ==Retirement==