InstructionOwn75's journey

I recently applied for a position at Aerotek and had a brief virtual interview with a recruiter. They are now requesting that I send my passport or birth certificate via email for verification purposes. I’m hesitant to send such sensitive information through email, even though they are using a valid Aerotek email address. They mentioned that providing two forms of ID is standard for any job in the U.S. due to the nature of the company being military-related. They also stated that I won't be allowed on the job site unless I comply with this request. I haven't sent any documents yet and I'm wondering if this is a common practice or if it raises red flags. Has anyone else experienced something similar with Aerotek or any other company?