Because your resume may be viewed by a veteran or someone who does understand military ranks, people who understand the rank structure will wonder why it is missing. (job-hunt.org)
In the multiplayer mode, there is a ranking system in which you can progress through various military ranks - each rank allows you access to a new variety of parts and weapons. (crazygames.com)
The revised system, consisting of actual military ranks with novice players starting off as recruits and working their way up, is based on experience and time played overall. (consolemonster.com)