Skoog Haslum began her naval career in 1990 as an acting sub-lieutenant in Sweden's 2nd Surface Warfare Flotilla and was promoted to lieutenant in 1993.

After leading the 4th Naval Warfare Flotilla and becoming Deputy Vice Chancellor of the Swedish Defence University in 2016, she was promoted to rear admiral.

[6] Skoog Haslum's first position outside the navy was from 2001 to 2003 when she served in the Future Planning Department (Perspektivplaneringen, PerP) at the Swedish Armed Forces Headquarters in Stockholm.

[6] For almost 6 months in 2007, she captained HSwMS Sundsvall in the UNIFIL Maritime Task Force (MTF) and patrolled the coast of Lebanon, to stop gun smugglers and terrorists, and to ensure aid deliveries reach Beirut, and not be cut off by pirates.

The Deputy Vice Chancellor has an important role in the development of the university and is also responsible for collaboration with foreign defense colleges and other international partners in the military field.

[11] On 24 October 2024 the Swedish government announced that Haslum would succeed Lieutenant General Carl-Johan Edström as Chief of Joint Operations on 15 November, and would be promoted to the rank of vice admiral.