Rangers are smart, tough, courageous, and disciplined

 Rangers are role model Soldiers – mentally, morally, and physically –  who use their minds as well as bodies to make sound judgments, reasoned decisions, and ultimately to never quit.  Rangers demonstrate discipline both on and off duty, and their Regimental standards are enduring. 
When then Army Chief of Staff General Creighton Abrams envisioned the modern Ranger force, he emphasized the professional unit excellence stems from individual Ranger personal excellence and character.  He directed that "wherever the battalion goes, it will be apparent that it is the best".  Members of the 75th Ranger Regiment live this charter both personally and professionally every day. 

http://www.goarmy.com/ranger.html