My first few missions all happened on the same day. The Chinook went to all in the same flight.
Because of the increased number of aliens in Light Scouts, this meant that li'l thothkins managed to notch 10 kills in those missions.
I noticed that there wasn't a "killed 5 aliens" medal, but instead it went straight to the "killed 10 aliens" medal. Other soldiers got their "5 kill" medals as normal.
Li'l thothkins seems to have been punished for success. Admittedly very unlikely success considering previous Let's Plays