Question about Harm's leadership in Season 2
In Season 2, Harm was a Lieutenant Commander (O-4) and Sarah MacKenize was a Major (O-4) which their ranks are equal.
Harm seems to be a leader of his team (Mac and Bud). Is that right that he is senior than Mac?
I was thinking that Harm was a leader which Mac was like his aide, and Bud was their assistant.
The reason I brought up because I was watching Episode 1 in Season 3. Harm said something about giving an order to Mac and said like "That is an order.". Both of them were still at O-4 level.
Thanks!