A Pipe Hitter, Eddie Gallagher replied, stems from a term frequently used by the military of the same name to describe “someone you want with you during tough situations, someone who has your back and is willing to sacrifice and work hard to get the job done.”

"pipe hitter (noun) a term used in the US military community to describe special operations personnel in the US military, such as the Delta Force, SEALS, the 75th Ranger Regiment, and Special Forces. Pipe hitters are units of some of the most highly respected, well-trained, and qualified operators."