After all, there can be no leadership where there is no team. - Jocko Willink

Every moment you are alive is made of choices you get to make.
Little, tiny choices that alone mean nothing, but when combined together, mean everything.
You have to make the right choices. The hard choices.
You have to deny immediate gratification and pushback against weakness.
You must impose Unmitigated Daily Discipline in all things.

For this reason, they must believe in the cause for which they are fighting.

Accountability is an important tool that leaders must utilize. However, it should not be the primary tool. It must be balanced with other leadership tools, such as making sure people understand the why, empowering subordinates, and trusting they will do the right thing without direct oversight because they fully understand the importance of doing so.