A few other points. Agencies can define the qualifications for a position, but the initial screening of applicants is often done by an independent HR group (still within the agency but independent of the group trying to fill a position), or sometimes by the Office of Personnel Management. Even if it’s by an independent group, the OPM rules have to be followed. The HR staff is often unfamiliar with what the position requires, and they may not understand when someone’s response actually demonstrates they have the qualifications and when they don’t. On top of that, they are subject to OPM audit, so their goal is to make sure the i’s are dotted and the t’s are crossed, not necessarily to provide the most qualified candidates from the applicant pool. Lesson - read the application very carefully and slowly, and do exactly what it says.
There are applicants who “game” the system and state their answers as positively as the system allows, even if their resume and written answers demonstrate that they are “stretching the truth,” to be kind. Those who are honest may not make it through the first cut, because the HR folks will look at the yes/no and multiple choice responses and ignore the written material because they don’t fully understand it. Only after HR makes their decision about who is qualified and who isn’t do the remaining applications go to the subject matter expert and the hiring decision maker. Lesson - answer the questions as optimistically as you truthfully can.
Because of this, when the office who wants to hire someone finally gets the approved list of applicants, there often is no one on the list who is truly qualified. In that case, the decision is made to not hire anyone, and the process has to start again at the beginning. If there are any errors in the entire process, either actual or perceived, then the process may be halted and have to re-start. I’ve seen this happen when the announcement discussed a relatively small part of an agency (one that would not be widely recognized) and neglected to note that this organization was a part of a larger, well-known federal agency. The announcement had gone through the entire process of preparation, approval, and posting when this was noticed, and the decision was made to halt the process and start over with the larger agency name in place of the sub-organizational name.
As far as job security goes, there is a lot of truth in that. But there are other key motivators for working for the federal government. Let’s face it, you can play with some pretty neat toys in the military or Defense Department. You also have opportunities to get involved in making national or international policy, usually much more so than if you’re outside of the government. There are definitely some jobs where you’re going to have to put in some long hours, but for the most part, the regulations say that most feds only have to work 40 hrs/wk, and that additional hours have to be compensated in some way, such as equal time off. For many professionals, that’s a very nice benefit compared to commercial firms where it’s usually expected that you’ll put in 60 hrs/wk or more, all for one low, low price.
BTW, my understanding is that it’s a 3-year probationary period, not just 1 year. I think that someone can be terminated relatively easily within that probationary period (e.g., it’s just not working out). After that, though, it can be done, but it requires significant documentation of extended poor performance and efforts to correct the problems.
(Edit) Forgot to note that the process isn’t easily rigged - there may well be specific people that are targeted, but the OPM-driven process goes a long way to make that difficult. That’s not to say it doesn’t happen - it can and does - but from what I’ve seen, there is more interest in bringing in people who are qualified than in people that are known.