The USAF has a goal to supply 50%t of its fuel requirements from domestic synthetic sources by 2016. This study had 2 objectives. The first was to develop a coal-biomass-to-liquids (CBTL) plant design that is potentially capable of co-gasifying mixtures of coal and biomass to produce a clean synthesis gas that can then be sent to Fischer-Tropsch units for synthesis of clean diesel, jet and naphtha liquid fuels. The second objective was to develop a CBTL pathway for diesel fuel production that has the potential of providing 100,000 BPD of synthetic fuel with the requirement that carbon dioxide emissions should be less than those from conventional petroleum. Three biomass types were selected for study: woody biomass, switchgrass, and corn stover. Illus.