Table: us_aaf_units
Columns: type_of_unit
type_of_aircraft
number_of_aircraft
number_of_crews
men_per_crew
total_personnel
officers
enlisted

Question: Name the number of crews for light bombardment group
SQL: SELECT "number_of_crews" FROM us_aaf_units WHERE "type_of_unit" = 'Light bombardment group'

Question: What is the aircraft for 21 crews?
SQL: SELECT "type_of_aircraft" FROM us_aaf_units WHERE "number_of_crews" = '21'

Question: Nam ethe enlisted for troop carrier group
SQL: SELECT "enlisted" FROM us_aaf_units WHERE "type_of_unit" = 'Troop carrier group'