Most likely a war based in Cyberspace, the military engaging in which may not have much support from their home population.
A soldier who has just got back from CyberNam can be found on the upper floor of Orion's Belt at Polysorbate LX in Space Quest 6.
References[]
Refers to the Vietnam War and how the United States soliders were treated on their return home.
Notes[]
According to the comments left in by the developers that accompany the in-game text in the data files, the guy is a pilot. This information has not, however, been mentioned in actual in-game text and therefore probably not 100% canon.