Write an application to your immediate boss by requesting a leave, mention date of departure, date of arrival in school, No. of days on leave.
You just submit an application, next process is the responsibility of the office and officials concerned.
I think my answer will be enough!
You don't . Go to the office and get the needed form.
Go to the office and get the form for this. You don't need a letter.
No, they are US citizens.
You don't . Go to the office and get the needed form.
You don't . Go to the office and get the needed form.
You don't . Go to the office and get the needed form.
You don't . Go to the office and get the needed form.
You don't . Go to the office and get the needed form.
You don't . Go to the office and get the needed form.
You don't . Go to the office and get the needed form.
You don't . Go to the office and get the needed form.
You don't. Go to the school office to fill out a form they will give you.