Affirmative action for the disabled is an interesting issue. When the disabled are also veterans, then you really have something worth thinking about.
Please read:
Disabled Veterans Affirmative Action Program. (n.d.). Feds hire vets. Retrieved May 15, 2014, athttp://www.fedshirevets.gov/hire/hrp/dvaap/index.aspx
Hiring Veterans (n.d.). U.S. Department of Labor. Retrieved May 15, 2014, athttp://www.dol.gov/dol/topic/hiring/veterans.htm
Reynolds, T. D., & Nichols, R. M. (2013). New affirmative action requirements for federal contractors and subcontractors regarding veterans and people with disabilities. MONDAQ (October 10). Retrieved May 15, 2014.

Then answer this question: Should disabled veterans get preferential treatment over better-qualified candidates who are not disabled veterans?

Additional References:

Burns, P., and Schapper, J. (2008). The ethical case for affirmative action. Journal of Business Ethics,83:3 (December) 369-79.

Affirmative Action Resources. (2013). Hr-guide.com. Retrieved May 15, 2014, at http://www.hr-guide.com/Law/AffirmativeActionResources.htm

Hiring/Affirmative Action. (n.d.). U.S. Department of Labor. Retrieved May 15, 2014, athttp://www.dol.gov/dol/topic/hiring/affirmativeact.htm