Database: student_loan
Question: Among the students enrolled in UCLA, what is the percentage of male students in the air force department?
SQL: SELECT CAST(COUNT(T4.name) AS REAL) * 100 / COUNT(T2.name) FROM enlist AS T1 INNER JOIN person AS T2 ON T1.name = T2.name INNER JOIN enrolled AS T3 ON T3.name = T2.name LEFT JOIN male AS T4 ON T2.name = T4.name WHERE T3.school = 'ucla' AND T1.organ = 'air_force'