We all know Special Operations are the best at conducting Combat Operations. What type of unit do you feel is the best support unit?

I know I'm going to get a lot of flak for this, but I say Rangers. Now, I DO understand that Rangers are (or at one point, WERE) a Special Operations combat force. Although, here lately, it seems their primary mission has been to guard roads, and provide external security for CAG. If that ain't support, then I don't know what is. They aren't being utilized the way that they used to, and have, essentially, become glorified road guards for the higher echelons. SF uses them, CAG uses them, SEALs use them, and so does PSYOP. So can we really say that Rangers are the best of the best if they are being stuck doing the b*tch work for the other SOCOM departments? Or have they become a combat-oriented Support entity?

Actually Special Opns are best at certain. limited size operations. They are invaluable when a highly trained, highly skilled, well coordinated unit is needed for a specific mission. But large scale combat operations (think invading Iraq) still require large scale units like multiple infantry divisions. Same is true of support units. We need them all.
Having been an infantryman in jungle combat, I say the best support unit is the one you desperately need at the moment who responds to your needs. They're all the best, just at different times.

Not sure in today's terms, but in my day mine was the best or I improved it.

This goes without saying. your friendly local Communications unit.
You can talk about us, but you can't talk without us....

Best Support Unit covers a lot of ground.
For best Comm Support I'm going to nominate the Joint Communications Support Element out of MacDill AFB.
Its members are comprised of all 4 major services, deployable & task oriented teams are mostly comprised of all service members who work together daily in 3 years stints leading to a tight knit well integrated unit.
The vast majority of JTF's on their initial tour call on this unit for their initial Comms capability until their organic support can trickle in.
The full spectrum of Comm Suites is available, including even the rarely called out long haul HF.
Various sub-units within JCSE add Airborne capabilities and a Joint Airborne Command Control and Communications Post (Jackpot) was part of the options available the last I knew.
It's an amazing group of Professionals who get the job done with short notice, quickly deploy & recover, and get ready for the next call out.