Navy lieutenant was in charge of the Motor Gun Boat carrying them. The small group would wait for the dark of a moonless night to attempt their missions, with Roelfzema going ashore with whoever was being dropped. 108 such returned to the Netherlands by parachute or boat to support the resistance. Only half survived the war. On 22 February 1942, Roelfzema's 'transport service' performed an infiltration for his friend Ernst de Jonge. They rowed ashore at Katwijk. Roelfzema had already become suspicious that something was amiss with their insertion operations. He feared they were being betrayed by Nazi sympathizers present amongst the officers of the exiled government. Some three months after De Jonge's drop, a courier on his way to England was picked up by the secret police. He was carrying detailed reports written by De Jonge that had been transferred onto three roles of microfilm. De Jonge heard about the arrest but refused to go into hiding. Three days later, on 22 May, De Jonge and two of his fellow agents were arrested at an apartment in Rotterdam. They were brought to Kamp Haaren. From there they were transferred to Assen. Roelfzema did not hear from him again; De Jonge and a group of 52 others were sent to the Rawicz concentration camp in Poland. Of that group, 47 were sent over to Mauthausen, where they were executed. Ernst de Jonge remained with six others at Rawicz and died there in September 1944; he has no known grave. With the capture of De Jonge, Roelfzema blamed de Bruyne. When de Bruyne instructed Roelfzema to provide information to another branch of the exiled Dutch government, Roelfzema refused for fear that it had been infiltrated by Nazi sympathizers. De Bruyne was angry with this insubordination and moved to have Roelfzema court-martialed. Queen Wilhelmina intervened and recommended him for the Netherlands' highest honor, the (Military Order of William). The court-martial proceedings were set aside and the was bestowed upon Roelfzema in the summer of 1942 by the Queen. Following this he met with Dutch Navy minister Johan Furstner and the court-martial was cancelled. Roelfzema had had enough of working with the secret service. He resigned from the Mews and volunteered to serve in the Royal Air Force. The British military historian M. R. D. Foot has confirmed the degree of German penetration of SOE's Dutch networks, something SOE denied during the War.