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Janssen is one of the men in the Dutch Resistance group (along with Smits, Goriss, De Leeuw, Van de Berg and Van Dyke) that saves James Doyle after the latter's B-17 Flying Fortress was shot down over the Netherlands. Their leader was Major Gerald Ingram (it is unclear whether Ingram is already a commanding officer of the SAS by the time of this mission).
After Doyle joins their group, they continue their raid and succeed in blowing up a train bridge, vital to the German war effort.
- The Dutch resistance men are among the few who can be seen wielding the Lee-Enfield and if one of them dies, it is the only time you can pick up the gun and wield it in Call of Duty: United Offensive.
- Janssen is a common name in the Netherlands.