This study is an assessment of whether the US Air Force should anticipate modernizing its core theater airlift fleet with aircraft designed for super-short takeoffs or landings under rough-field conditions (SSTOL-RF) or aircraft designs focused on vertical takeoffs or landings (VTOL) with secondary SSTOL-RF capabilities (V/SSTOL-RF). [Robert C. Owen, PhD / 2019 / 37 pages / ISSN: 1528-2325 / AU Press Code: FP-129]