Could someone in the DLI confirm that Korean is the hardest language taught in the military?

I remember reading in a forum that everyone in DLI knows that Korean is hardest, even harder than Japanese.

Somebody wrote in About.com about the Navy:

Right now only 8 Languages are being taught (for Navy). Cat IV: Arabic, Chinese, Korean. Cat III: Persian-Farsi, Serb-Croatian, Hebrew, Russian. Cat I: Spanish. Those are your only "options" and I have not received my language yet, but I did give them my top 3 selections of Korean, Russian, and Arabic. Everybody is telling me this about my selection. Korean I probably won't get because I only have a 103 DLAB. Korean is the hardest language here, apparently it is 75 weeks long now, and they are trying to make it a Cat V language." (Could someone confirm the bolded part?)

My oldest brother in a DLI graduate in Russian, many years ago. He studied both Japanese and Korean. He said the tonal languages are by far more difficult.

Wishing you success in all that you strive to do,