Hi trueace,
I'm not an eye doctor so I am not sure if green/red deficient is the same as being "color blind".
However, do not go disqualifying yourself until you have personally checked with the various Agencies HR/Personnel Offices, AND they have absolutely convinced you that you do not qualify because of the vision issue. In other words, do not give up before you even start!
As I have stated in another thread, the Federal Personnel Manual is extremely complex, confusing, and full of exceptions (if one were motivated to research and find them). A case in point/true story, a few years ago there was a candidate who management wanted to hire, but who was so nearsighted that Mr. MaGoo had better vision (I'm exagerating a little for emphasis, but not by much - I believe he is 20/400 uncorrected in one eye). The candidate was also a military veteran, and the Personnel Specialists "found" some obscure exception exempting military veterans from some of the physical requirements. The candidate was hired, and is still currently a GS-1811 Special Agent (and a good one too!).
Law Enforcement is not a profession for quitters. If this is the career you want, you are going to have to fight a little harder for it. Emphasize your strengths and downplay (don't hide but don't highlight) the vision issue. Best wishes and good luck!
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"When you have eliminated the impossible, whatever remains,
however improbable, must be the truth." Sir Arthur Conan Doyle