This is another winner!
This is the very first book that has author addressing the fact that gunfire is loud, and in a confined space it's VERY loud. I found myself hoping he/she would've taken the next logical step and have the character stuff something into their ears to protect them. We all have our pet peeves. 
Anyway, this story had a lot of depth. I like how the author brought the characters from place to place in and around the complex while creating unique challenges for them to overcome. The descriptions were well organized, and most of all believable.
The author gets a style point for each the following:
- When J.B. squished the truck into the black suits against the wall.
- When our team figured out how to wear the bird coats, and then hang out with them while they were getting jiggy with it.
- When the characters fired up the ark spaceship, went back in time to kick some alien buttookski before returning and crashing the ship upside down while on fire.
Well, maybe not the 3rd one, but it seems to me if he/she had 50 more pages they could have fitted it in.
I don't get the virus thing. It almost kills Ryan yet he recovers quickly and then...nothing. The back story made it seem like the white coats had a winning killer bug so I was surprised that this just petered out.
Finally, the only out of character thing that stood out was when they used all 10# of C4 to obliterate the mat trans. You just KNOW J.B. would've used only 5#, RRiiiiggggghhhhht?