1st Gas Regiment
... that by the time of the 1918 Meuse-Argonne Offensive, none of the soldiers of the American 1st Gas Regiment had fired chemical weapons in combat?
... that by the time of the 1918 <a class="mw-redirect" href="./Meuse-Argonne_Offensive" id="mwBks" rel="mw:WikiLink" title="Meuse-Argonne Offensive">Meuse-Argonne Offensive</a>, none of the soldiers of the American <b id="mwBkw"><a class="mw-redirect" href="./1st_Gas_Regiment" id="mwBk0" rel="mw:WikiLink" title="1st Gas Regiment">1st Gas Regiment</a></b> had fired <a class="mw-redirect" href="./Chemical_weapons" id="mwBk4" rel="mw:WikiLink" title="Chemical weapons">chemical weapons</a> in combat?