Sorry Mongo, but you're definitely not going to gain any ground with the "Deception by Omission" argument. As scout and LITS already mentioned, "Omission" isn't an offense in any way, if the subject matter isn't asked of you.
If you're doing a security background check, and the question is asked, which countries have you visited in the last 10 years, and you list them all EXCEPT Iran, then you have deceived by omitting information that was asked of you. There are plenty of questions that you could be asked, that you could deceive based on information that you left out.
However, there are plenty of "Subjects" that aren't routinely discussed in the military. Some because they are "Socially Unacceptable" and some because they are a policy.
Questions not asked because they are Socially Unacceptable to ask:
1. How often do you masturbate.
2. When you were younger, did you ever see your parents naked
Questions not asked because there is a policy that says you can't:
1. Are you gay
2. Have you ever had a sexual relationship with someone of the same gender
As Scout and LITS said; there is no deception, because you didn't openly discuss and mention information about topics that weren't discussed. With your way of thinking; as LITS mentioned; you're suppose to walk into the academy/military and cleanse your soul of every experience in your life. You need to tell them that when you were 8, you killed the neighbor's cat with a BB gun, because you thought it would be cool, until you actually did it. How you picked on the kid at school with Down's syndrome. How you played practical jokes on the fat kid in school. How you shoplifted candy from the store, how you drove through a red light when you were older and got your license, how you lied about being involved with putting graffiti on the rival school's buses.
The majority of your past is considered private. It is socially unacceptable to ask for such disclosure in an official setting. Some things, like your sexual orientation is forbidden by policy to be asked of for disclosure.
In other words, which you already know, you can not be accused, charged, etc... of "Omitting" something if it wasn't "EXPECTED" to be provided. When your security background wants to know the countries you've been to, any crimes committed, use of alcohol/drugs, dealings with no citizens, etc... They are "Expecting" 100% disclosure on these topics. But they are NOT "EXPECTING" you to disclose your sexual preference, how often you masturbate, sexual fantasies, social abnormalities as a child, childhood pranks, etc... Hence, the definition of "DON'T ASK, DON'T TELL".
Now, did you really need me to go on this rampage, simply to tell you the definition and military expectation, of something you already knew?