From 1947, Ehnbom served as the head of the special technical section at the Weapons Office within the Royal Swedish Army Materiel Administration's Ordnance Department.
[4] In March 1940, Ehnbom became a voluntary lieutenant for Finland during the Winter War and the commander of a Swedish 7.5 cm anti-aircraft battery near Turku.
[6][7] From 1 April 1947, Ehnbom was attached to the Royal Swedish Army Materiel Administration's Ordnance Department as the head of the special technical section at the Weapons Office.
Ehnbom placed high demands on versatility in instrumentation, particularly in the case of the Bofors 40 mm Automatic Gun L/70.
As the arméöverdirektör, Ehnbom became the Chief of the Swedish Army Electrical and Mechanical Engineers' Corps on 1 October 1958.
The Army engineers were managed by Ehnbom along with Gösta Cronvall, who was the head of the central section.
[6] As the head of the military workshops, Ehnbom implemented a rationalization of the entire organization, which also led to the establishment of regional supply lines.
He achieved this, among other things, by relinquishing all responsibility for equipment maintenance and care until the authorities decided on an improvement.