Chronic health problems such as cardiovascular disease, diabetes, obesity, cancer and kidney disease account for more than 75% of the nation's $2.7 trillion in annual spending for medical care, says Ursula Bauer of the Centers for Disease Control and Prevention.
He might need to have one while waiting for a TS clearance to go thru. They take from 1-4 months for the interim, the TS clearance could take from 1 month to 2 years from what I have seen. I had to wait 2 years for the final one to go thru. As I said I have also seen people get them really fast too.
1 If approved, student is issued an EAD. 2  If the USCIS does not adjudicate the request within 90 days, the student may go to the local USCIS office and upon presenting the receipt notice from the Service Center, receive an interim employment authorization document that will be valid for 240 days.