No. The policy goes back to at least WWII.
Military commanders of bases were allowed wide discretion about who they allowed to be armed up until Ft. Hood, in 2009. Then Obama instituted "reform" which effectively removed much of the discretion.
Then in 2016, after President Trump was elected, but before he took office, the latest directive was issued.
It supposedly allows commanders to issue permits for people to be armed, but no sane commander will issue one given the specifics in the directive.
The article gives several examples of how all the incentives in the directive are aimed at preventing people from getting permission to carry.
For example, the directive calls for a commander to get a legal opinion about which, of specific exceptions in federal law, are valid, for a military person to carry in federal buildings, before a military person can be given permission to do so.
I recall three exceptions. Two mostly would not apply, as I recall. The one which would easily apply, is nullified by the way the directive is written. Commanders have to get the legal opinion before granting permission.
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