user: Question: What was the number of Personal Staff Units Killed?
Columns: ['Unit', 'Complement', 'Killed', 'Wounded', 'Missing']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Head Quarters', '150 off[icers] 1231 men', '0 off 0 men', '2 off 0 men', '0 off 0 men']
SQL:

assistant: SELECT "Killed" FROM "Table" WHERE "Unit" = 'Personal Staff';