Earlier quoted context omitted.
Unfortunately, "there are two oceans between us and any potential aggressors" is no longer a viable defensive posture. If you're gonna be drawn into a war today it's unlikely to come with years of lead time.
Logistics in 2020 aren't much easier than they were in 1920, or in 1820. And the lead time for ICBMs to kill ~ a billion people has been ~40 minutes for the past 40 years.
The Russian equivalent is called the CRRF, and has a similar force mix for obvious reasons.