So long as a disability can be accounted for and the serviceman can accomplish the major tasks without putting their fellow servicemen and servicewomen at risk they should be allowed to serve in the armed forces. Assuming that the blind gentleman that is serving in the Army Special Forces meets those two criteria he should be recognized as an example to other disabled people.
Since the passing of the Americans with Disabilities Act in 1990 and the more recent incredible advances in technology, there is absolutely no reason why the military couldn’t allow intelligent, enthusiastic and responsible people with disabilities to join the armed forces in noncombat positions, and have the opportunity to serve country. A great example of non-combat jobs are all computer related positions, which today is likely to be more than half the jobs done in the military.
I believe that the appointment of a blind man to serve in the Army Special Forces is a step in the right direction for equality. There will be many positions available that would be suitable for a blind person to fill, who could be just as able in these positions as a person with full vision. If a blind person meets the specifications required for the job position, then I see no reason why they should not be treated equally in the selection process.
It should be up to the Army if they can take a person that is blind. It's not fair to a person that has a disability to have to risk their life in order to serve in the same way that someone without a disability would have to do. In the end, soldiers must be fit.