A.R.C. Troopers

During the Clone Wars, a certain type of soldier was needed as a special force for the Clone Core, these soldiers would be specialized and highly trained above the average Clone Trooper. These Troopers were for high risk missions. These soldiers would be called ARC TROOPERS.
Advanced Recon Commandos.

https://www.pinterest.com/pin/270567890096929337/

Advanced Recon Commandos were like the Navy Seals of the Clone Army, if there was a high value Target then the ARC Troopers were the ones for the job to obtain the target. If you need an infiltration mission then they specialized in Recon missions as well. These were battle hardend veterans who showed much prowess on the battlefield. 

Many of the ARC Troopers wore different armor sets and color variations form normal Standard Clone Troopers as well as Other Arc Troopers. There armor would be more advanced as well as hold more equipment, along with that because of the difference many soldiers would be recognized by their paldrin on their shoulders to signify their rank.  

https://www.pinterest.com/pin/270567890097004870/

https://www.pinterest.com/pin/23643966778108449/

https://www.pinterest.com/pin/730075789563551134/

https://www.pinterest.com/pin/782641241466509141/

Many of these ARC Troopers would act as commanders of Clone Trooper Battalions as well as second in commands if leadership was needed. 

In short 1 ARC Trooper was worth 10 Standard Clones. These Troopers were the best of the best and they were not a force to be trifled with lightly. 

Training Quality: 

 Again these ARC Troopers were trained very highly and extensively, the first batch of Arc Troopers were trained under the personal tutelage of none other than Jango Fett, The galaxies best bounty hunter at the time. Afterwards these first batch of Arc Troopers would later go on to train the future Arc Troopers of the Clone Wars until the end of cloning. 

If you want to see more on Arc Troopers check out these videos on Youtube.com 

1. The Lore Guy  

https://www.youtube.com/watch?v=z9mgJF7qC0Y

2. Star Wars Explained 

https://www.youtube.com/watch?v=goqipbIoS7k

3. The Scoundrels Cantina 

https://www.youtube.com/watch?v=kaNXu7WSZ2I