Does anyone have any idea how to get into the UFO Sightings office in the CIA HQ mission of SC1? Is it even possible, or are the devs toying with us? I found all the data sticks in the area and can't find a code!

There's a door code in one of them, I believe. I forget which data stick though.

its on the computer right by the door.

Once you enter the outer office and access the computer, you get a scrambled email. In that email you will find the code for the door.

UFO Sightings room Keypad: 020781

I was hoping there would be more to see in that room than there was.
Two other "hidden rooms" in the fist game. In training, do a double jump to get up to the area above and behind you when the game starts (the right side as you look down towards the far end). Pick up a lock pick in that room. Then go through the obstacle course and at the far end is a room on the right side. Use the lock pick to get in and use the computer. Backtrack throgh the course and this time jump up on the other side and you find a keypad door. Use the code you found and meet somebody inside.

The other one is in the minefield section. As you enter the minefield notice the area up above you on the right side where the guard is. If you can get up there, there are some supplies in there for you. If you are very good, you can get up in there without any alarms or KOing or shooting anybody. Now that is a challenge!