Write SQL query to solve given problem: Which students that are in the marines have been absent for 6 months?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T1.name FROM longest_absense_from_school AS T1 INNER JOIN enlist AS T2 ON T1.`name` = T2.`name` WHERE T2.organ = 'marines' AND T1.`month` = 6