Or, one of several acceptable alternative REAL IDs, a Passport Book / Card, and a Military ID are acceptable alternative REAL IDs.
Check the DHS and TSA websites for a more comprehensive list.
Most people don’t have a Passport or Military ID.
So, REAL ID DL from your state DMV is usually the only available, and affordable REAL ID alternative for most citizens.
That is why they say it’s the minimum mandatory one.
But, there are several alternatives that are acceptable if you are qualified / can afford them.
But, know that the REAL ID standards are the same document proofs with or without cost increase, or having to join the military.
All can be used with TSA to board a domestic flight.
The Passport gives you the option of international travel, and the military ID gives you the ability to enter Military bases, and facilities that may not allow civilians even with a REAL ID DL only;
depending on their Force Protection alert status level, or other restrictions at the time you wish to visit.
I hold all of them, and I am not authorized access to many other restricted areas that even active duty personnel are not allowed in unless they are assigned within one of those areas, and then only that one, not any other that they are not assigned / authorized to enter.
In the military you don’t try to go where you are “off limits.”
Like not carrying into a gun free zone even if you hold a CCW permit/license whatever your issuing authority calls that, if not allowed in yours, or another state, or federal jurisdiction.
Nice that you hold that item, but it too is not all inclusive. Like an actual LEO on duty could go into.
Like your standard DL does not authorize you to operate what a CDL w/ endorsement(s) is required to operate.