"We believe that Sikh-Americans should be given an equal opportunity to serve in the US Armed Forces without violating their religious obligations," they said.
In a letter to Carter dated November 11, these retired military leaders cites the heroic efforts and valor of the few Sikhs who have joined the US forces in the past few years.
Since 2009, the US Army has granted individualized accommodations to three Sikh Americans, who wear turbans and maintain unshorn hair, including beards, they said.
Two of them deployed to Afghanistan, earning a Bronze Star Medal and MSM NATO Medal for their service, noted the letter which was released by Congressman Joe Crowley, a top Democratic lawmaker in the US House of Representatives.
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"The support for allowing Sikh Americans to serve in our military while adhering to their religious beliefs is overwhelming, as most recently evidenced by the letter to Secretary of Defense Carter from a group of prominent retired military leaders," Crowley said.
The retired officials said Sikhs are admired throughout the world for their martial prowess and serve with distinction in the armed forces of Canada, India, and the UK.
"Although Sikhs have served honorably in the US military since World War I, restrictive appearance regulations adopted in 1981 created barriers to their service. Revisions earlier this year to DOD Instruction make it possible for service members to request religious accommodations," they said.