Looking for a modern day AU series

[manuela75]

Hi,

I read this series a long time ago.
I think they are some kind of elite anti-terrorist unit. They live together on the ranch, and by the end most of them has children.
In one part Chris gets hooked on drugs - by his brother(?)
Also he gets involved with the owner of the next ranch, they have a kid (maybe two) then the woman leaves him.

That's all I remember and cannot find it anywhere.

thanks