, ▁ 1 0 1 st ▁Air bor ne ▁Division ▁in ▁March ▁ 1 9 6 6 . ▁From ▁late ▁January ▁ 1 9 6 7 ▁to ▁ 1 9 6 8 , ▁Math es on , ▁who ▁came ▁to ▁be ▁known ▁by ▁his ▁men ▁as ▁" The ▁Iron ▁Duke ," ▁commanded ▁the ▁ 1 st ▁Brigade , ▁ 1 0 1 st ▁Air bor ne ▁Division . ▁He ▁commanded ▁extensive ▁" search ▁and ▁destroy " ▁operations ▁against ▁the ▁V iet ▁Cong ▁and ▁North ▁Vietnam ese ▁Army ▁Reg ular s , ▁including ▁Operation ▁H ood ▁River . ▁He ▁established ▁a ▁camp ▁near ▁Duc ▁Pho , ▁Republic ▁of ▁Vietnam , ▁which ▁he ▁named ▁C AR ENT AN . ▁In ▁January ▁ 1 9 6 8 , ▁he ▁was ▁assigned ▁as ▁the ▁Senior ▁U . S . ▁Army ▁advis er ▁to ▁the ▁I ▁Corps ▁T act ical ▁Zone ▁ ▁In ▁April ▁ 1 9 6 8 , ▁Math es on ▁assumed ▁duties ▁as ▁Director , ▁R OT C - National ▁Def ense ▁Cad et ▁Corps ▁at ▁Fort ▁Mon roe , ▁Virginia ▁after ▁leaving ▁his ▁command ▁of ▁the ▁ 1 st ▁Brigade , ▁ 1 0 1 st ▁Air bor ne ▁Division ▁in ▁Vietnam . ▁In ▁July ▁ 1 9 6 8 , ▁Math es on ▁was ▁selected ▁for ▁promotion ▁to ▁major ▁general . ▁In ▁ 1 9 6 8 , ▁he ▁assumed ▁command ▁of ▁the ▁ 1 0 1 st ▁Air bor ne ▁Division . ▁ ▁In ▁the ▁fall ▁of ▁ 1 9 7 0