I think you can, but most people take the standard deduction every year (which is supposed to represent these things) rather than calculate the itemized deduction with receipts.
"national security" records are still public via FOIA, but can be redacted. Either way, if it's government, there needs to be transparency and a paper trail.
Having worked in public policy for several years, the 26-year-old Londoner had come to an alarming realisation about the future of the UK, the world – and the human species.