He was transferred to serve as the commander of I Corps, which oversaw the northernmost part of the country, from 7 December 1962 until August 1963 the next year, when he was replaced by Major General Do Cao Tri.
Cao Cao | Cao Wei | Tri-State Tollway | El Tri | Pierre Cao | Russian battleship Tri Sviatitelia | Tri Nations | Tri-Cities, Tennessee | Quảng Trị | Cao Zhen | Cao Rui | Cao Đài | Văn Cao | ''Tri Sviatitelia'' | Tri Nations (rugby union) | Tri-Hill, Pennsylvania | Tri-Hill | Tri-County Conference (Southern Indiana) | Nguyen Cao Ky | Joseph Cao | Đèo Văn Trị | Cao Xiu | Cao Gangchuan | Cao Bằng Province | 2008 Tri Nations Series | ''Tri Sviatitelya'' | Tri-Service General Hospital | Tri-Ergon | Tri-City Storm | Tri-Cities, Washington |