Is citizenship required for most jobs in cybersecurity?

Hello! I'm currently studying cybersecurity in school and am excited to enter the field. As I've been researching different jobs to see what kind of certifications and requirements most places require, I noticed that a lot of jobs in cybersecurity require U.S. citizenship and things like TS/SCI clearance.
I am a South Korean citizen with U.S. permanent residency and was wondering if it would be difficult for me to find a solid job in cybersecurity if I don't become a …

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