I'm really interested to see that all female unit in combat and how they fit into the story. There really seems to be a large amount of female empowerment this time around, and I find that very interesting. This unit (there name is somewhere) as well as the Beauty and the Beast Unit I'm sure will make for great characters as well as battles. Also I have noticed that combat pants that those female soldiers are the same as the ones Vamp wears, perhaps they were trained by Vamp, maybe he's their leader or something?
"Another threat comes with Liquid's elite personal guard known as the FROGS. Another squad of superhumanly-enhanced soldiers shown in previously released trailers, this all-female squad boasts cybernetic suits that allow them to cling to walls and fire at their enemies (you) from any angle. Their speed and acrobatic skills help them avoid incoming fire, which makes them even more dangerous. This is especially true when you fight them in the remains of a dilapidated hotel rigged with booby traps, where each step could be Snake's last."
http://uk.ps3.ign.com/articles/863/863825p4.html