RED ALERT 2: Yuri's Revenge: Enemy Unknown

Info about X-Com (from X-Com persepective)

Greetings Commander. There's a war on so I will keep this briefing short. Firstly, I presume you are already familiar with the CNC:YR Tactical Command Interface.
X-Com Soldiers
Rookie
All new recruits start out as Rookies. X-Com soldiers are the best in the world but they have much to learn before they can become an elite alien killing machine.
Squaddie
When a Rookie has proved himself in the field by killing several aliens he is promoted to Squaddie. By this time, the soldier will have improved his/her accuracy, speed and agility.
Sergeant
Sergeant is the highest promotion achievable by new recruits in any one battle. Sergeants are extremely valuable as they are very effective at eliminating the alien threat. They have killed many aliens and honed their fighting skills.
Captain / Colonel / Commander
These ranks are not available in a standard mission. They represent the cream of the X-Com forces and will only appear in high priority missions.