If your resume is a single page, you're wrong. The Army's resume system filters resumes by key word search. Be as verbose as possible or your resume won't make the first pass through the system.
I assume you have a resume loaded into the Resumix system (which is or shortly will be replaced).
That's it, in a nutshell. The government doesn't care what your experience is, they care what you SAY your experience is.
If you KNOW you can do the job you're applying for, then change your resume for it. Every job opening will have a listing of responsibilities. Rearrange them a bit (don't just copy and paste, please!), but make certain that the "key words and tricky phrases" that are in the job listing are also in your resume.
I know that the Air Force runs their job applications through Randolph AFB (in Texas), and the people working the civilian personnel positions there really have ZERO clue what the different jobs (that people are applying for) do, on a day to day basis. All they have is the position description, that was written (hopefully) by someone who knows what that position/job does. Since you're dealing with the zombies at civilian personnel, though, they're only going to pass you on to the next level if your resume has all the right words and phrases in it, and scores high on their qualification scale.
Once you get on the short list of qualified applicants, the hiring command has a little (but not much) leeway on who they can hire. If the supervisor there is really sharp, and willing to go toe to toe with the civilian personnel zombies, they can refuse all of the resumes, saying that none of those people really know what they're talking about......but that's usually the exception, not the rule. Also, remember that you're fighting against veterans preference applicants (every veteran gets a 10 point preference nowadays), as well as handicapped veterans (who pretty much have head of the line on any job they're qualified for), and anyone who might be on the "stopper list" (priority placement, where they were forced out of their job, for base closure or reduction in force, and the government is trying to get them into a position they're qualified for, that's closer to their old pay grade.....it's a method for the government to not lose so much of their talent during BRAC closures and RIF's).
Is the system screwed up? Most definitely. IMHO, when they went to resume only applications, they had no idea what they were doing, and should have stuck with the old application, which dealt with facts ONLY (but required more work on the part of civilian personnel folks, who actually had to READ and UNDERSTAND what people were writing.....oh my GOD!!!). Donald Rumsfeld tried to fix the system, but faced the wrath of the various government unions, and once he was gone, the government gave up the ideas he started, and went back to their old ways. But if you can get your foot in the door, you won't be sorry.