Back in my time in the military, there was an online portal that held your service information, the ability to request leave (time off), pay, etc. It was the place to go if you needed information aside from a paystub.

It required 8 char min, two upper, two lower, two special char (from a predefined list), and passwords would expire every 30 days. The thing is, most people knew all of their service info off of the top of their head. People also weren't requesting leave very often either, so most people would have to change their password on every login from some bullshit permutation of keyboard rolling with numbers and special chars tacked onto the end.

All that being said, you only had 3 attempts before lockout. No one wanted to risk lockout, so you'd make a throwaway password and reset it if you wanted to login. If you were locked out, it was a call to a civilian contractor with a hold time of 10-30 minutes just to get a temporary password emailed to you.

One of the easiest ways to fuck with someone was to intentionally lock out their account. It was trivial to find someone's username via searching through the email global address list. Then you pull up the portal, enter their user, smash the keyboard, and cackle as you have cost that person a guaranteed 10 minutes minimum just to do something trivial like print something from their file.