Lieutenant General DELCOUR was born in 1948 in Brussels and joined the Royal Military Academy École Royale Militaire in 1967 with the 122nd polytechnic class. Having graduated as a civil engineer in ballistics and armaments, he followed the Armour Lieutenant course in 1973. He then was assigned to the 1er Régiment de Lanciers until the end of 1975, in the positions of tank platoon leader and deputy commander of a tank squadron.

After attending the one year Long Armour Infantry Course in 1976 at the Armour School in Bovington (UK), he was assigned to the Armour Trials Unit in Leopoldsburg where he served for three years as test officer.
In 1980 he left this technical post to command B Tank Squadron of the 3^e Régiment de Lanciers that used to be part of the covering forces in Germany.
In 1983 upon completing a one-year staff officer course at the Royal Defence College, he was posted to the Army Staff, where he was responsible for the management of the Leopard tanks and CVRT reconnaissance vehicles as well as of the preparation of the Leopard tank modernization program.
Selected for the Advanced Staff Course in 1987-88 untertaken with the 102^nd Division, he then returned to the Plans and Programs section of the Army Staff in the capacity of armour desk officer for research and development.
He then commanded the 1^er Régiment de Lanciers from May 91 to June 93 after which he was assigned back to the Army Staff Plans and Programmes Section.
He remained in this staff for a second term and became chief Plans and Programmes Section in March 1996. This section was in charge of forces development and planning, major equipment procurement programmes, infrastructure and of the overall Army budget planning.
In October 1999, he took command of the 17^th Mechanized Brigade in Spich (GE) as well as the function of Commander of the Belgian Forces in Germany.
Promoted to the rank of Major General in December 2000, he left Germany to head the General Staff’s Material Division from January to December 2001 and filled the position of National Director of Armaments. In 2001, he also chaired the working group "Strategic Reflection", responsible for defining the policy of the Strategy Department within the unified structure of the Defence Staff.
During the merging of the General Staff with the Services Staff initiated in January 2002, he gained the responsibility of creating ab nihilo the Synthesis Division of Material Resources Directorate, responsible for all material resources, including infrastructure and CIS. Major General Delcour was simultaneously chairing the Principal Military Experts Committee of the FINABEL organization regrouping France, Italy, the Netherlands, Belgium, Luxembourg, Germany, the United Kingdom, Spain, Greece and Portugal.
In December 2003, he was appointed Chief of Staff of the Eurocorps Headquarters in Strasbourg.
This staff provided the core of the ISAF Headquarters from August 2004 to February 2005. Major General Delcour served in the capacity of HQ ISAF Chief of Staff with 31 participanting nations and a joint NATO HQ in charge of both land and air operations and.
He was promoted to Lieutenant General on 26 June 2005 and took over the Eurocorps command on September 23^rd of the same year.