The first question was mine, as regards he second,
The United States government classification system is established under Executive Order 13526, the latest in a long series of executive orders on the topic.[1] Issued by President Barack Obama in 2009, Executive Order 13526 replaced earlier executive orders on the topic and modified the regulations codified to 32 C.F.R. 2001. It lays out the system of classification, declassification, and handling of national security information generated by the U.S. government and its employees and contractors, as well as information received from other governments.[2]...
NOFORN: Distribution to non-US citizens is prohibited, regardless of their clearance or access permissions (NO FOReign National access allowed).
...the statement of NOFORN (meaning "no foreign nationals") is applied to any information that may not be released to any non-U.S. citizen. NOFORN and distribution statements are often used in conjunction with classified information or alone on SBU information. Documents subject to export controls have a specific warning to that effect. Information which is "personally identifiable" is governed by the Privacy Act of 1974 and is also subject to strict controls regardless of its level of classification. https://en.wikipedia.org/wiki/Classified_information_in_the_United_States
Despite the Residents EO the Two Man Rule for above confidential classified material & Need To Know protocols should have prevented his access to any information he wanted even in a civilian work environment.
All spaces below second deck on a carrier are classified at least confidential. Heck a Conventional Machinist Mate training manual was labeled Confidential I'm certain of that and I've seen them in second hand book stores. Even crew members can't just pick a space and enter without permission. For example Conventionals still required a Vital Area Badge for entry into machinery spaces. Trying to get a peek-a-boo at a weapons magazine would jet your head blown off by Marine Sentry posted at the hatch. The mission critical departments onboard took security serious. Not even the ships Master At Arms could enter "The Hole" without permission.
I went in most spaces on ship due to the nature of my jobs but places that had classified documents required permission and an escort at all times. IOW if I had gone into Main Comm for a high temperature trouble call they had to first lock up the paperwork, cover operating gear, and then let me in and follow me around. A trouble call to the Brig wasn't fun either. For the magazines only a handful of Snipes had needed clearance to enter if they were loaded.