@PG_Kelly Well. I doubt it was "beefed up" - they just selected a more restrictive plan that they already had on the books.
What I saw after 9/11 was "beefed up" where they have put in a many layered approach at every base I've been to. As a simple example, the gate near the base exchange and the Navy area have been closed for years at Buckley AFB. They make everyone go through the north or south gates instead. Semi trucks only at the South Gate where they are inspected before entry.