The Williams Institute released a study (pdf) on DADT yesterday. The key findings from the press release (pdf):
An estimated 66,000 lesbians, gay men, and bisexuals are serving in the US military, accounting for approximately 2.2% of military personnel.
Approximately 13,000 LGB people are serving on active duty (comprising 0.9% of all active duty personnel) while nearly 53,000 are serving in the guard and reserve forces (3.4%).
While women comprise only about 14% of active duty personnel, they comprise more than 43% of LGB men and women serving on active duty.
Lifting DADT restrictions could attract an estimated 36,700 men and women to active duty service and 12,000 more individuals to the guard and reserve.
Since its inception in 1994, the “Don’t Ask/Don’t Tell” policy has cost the military between $290 million and more than a half a billion dollars.
The military spends an estimated $22,000 to $43,000 per person to replace those discharged under DADT.