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A man holds a sign in support of the end of "don't ask, don't tell" on September 20, 2011 in San Francisco, California. The end of the 18 year-old law "Don't Ask Don't Tell" took effect today now allowing gays to openly serve in the armed forces.

This week, the military is marking the one-year anniversary of the repeal of Don't Ask, Don't Tell.

Opponents of the repeal had predicted a breakdown in military morale and cohesion. A new study from UCLA suggests the policy has had little impact on the military.

A Martinez speaks to one of the study's lead authors.