Kammala wannan jumla: An nada Hederstedt kwamandan bataliya na Battalion na Majalisar Dinkin Duniya na Majalisar Dinkin Duniya a Lebanon (UNIFIL) a Lebanon a shekarar 1988. A Lebanon, Hederstedt ya gudanar da shawarwari da yawa a matakai daban-daban tare da wasu bangarori (misali, PLO, PFLP, Hezbollah,
Black Satumba, Amal, da dai sauransu da Isra'ila sun goyi bayan 'yan gwagwarmayar Kirista). Ya kasance kwamandan jami'in Life Guards Brigade (MekIB 1) a Svea Life Guards (I 1) a Kungsängen daga 1988 zuwa 1993. Tsakanin 1989 da 1992 Hederstedt ya kuma kasance Daraktan Daraktan Daraktan Daraktocin Majalisar Dinkin Duniya na Nordic da ke hulɗa da yakin basasa. Ya kuma gudanar da tafiye-tafiye na bincike zuwa wuraren rikici, gami da Cyprus, Kuwait, Iraki, Iran, da Gabas ta Tsakiya (Isra'ila, Gaza, da Lebanon). Hederstedt ya kasance kwamandan jami'in rundunar sojojin yamma a Skövde daga 1993 zuwa 1996. Hederstedt ya zama babban janar a shekarar 1996 kuma an nada shi Kwamandan Ayyuka na Kasa da Kasa a Hedikwatar Sojojin Sweden.