Show of Force is a side challenge for Commander's Challenge.
Well isn't this just great. It seems Commanders Shinzo and Kenji have finally reconciled and are working together again, just like old times. It would be better if the two of them weren't quite so chummy, since their combined forces pose a significant threat. If you think you have what it takes to defeat them, then please proceed by all means--you'll find them training here. As Kenji is being groomed as Shinzo's successor, Shinzo is likely to hold back until Kenji gets into serious trouble.