Since you're new here, I'll explain it.
His Zartan is on the HT Krauser muscle body. The army won't pose more than straight forward and to ride the swamp skier, they need to go much much higher. Plus, constantly posing and unposing the arms will cause the metal flange that HT used for the elbow to snap (think wire coat hanger). So even if he could, the posing should be kept to a serious minimum. I've nagged him until near exhaustion to get him to port Zartan over to a TTA or at least another muscle bod with shoulder articulation, to no avail. So... not gonna happen.