 Complete the following phrase:  Wagner PMCs were involved in both Palmyra offensives in 2016 and 2017, as well as the Syrian Armys campaign in central Syria in the summer of 2017 and the Battle of Deir ez-Zor in late 2017. They were in the role of frontline advisors, fire and movement coordinators and forward air controllers who provided guidance to close air support. When they arrived in Syria the PMCs received T-72 tanks, BM-21 Grad MLRs and 122 mm D-30 howitzers. During 