The judge has said he will request Mr Barrientos's extradition from Florida, where he now lives.
Some say they weren't consulted about the endorsement, according to radio host Miguel Barrientos, a supporter of Sen.
In 1969, Bolivian President Rene Barrientos Ortuno was killed in a helicopter crash near the village of Arque.
Vazquez requested an international arrest order for Barrientos, who has been living in Florida since the early 1990s.
CNN: Charges brought in Chilean singer's death, 39 years later
Jara's widow, Joan Turner, has urged the US to extradite Pedro Barrientos Nunez.
Brooklyn, New York ( VICE) -- Faustino Barrientos has spent most of his 81 years in complete solitude and isolation.
Barrientos' mother signed the parental consent form so her daughter could enlist.
CNN: Incentives drawing more Latinos to military, Rand study finds
Wilmer Barrientos, called on the military to accept the results.
Judge Miguel Vazquez said charges were warranted 39 years after the killing because the court had evidence that former officers Pedro Barrientos and Hugo Sanchez carried out the killing.
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"Ever since I was a little kid I wanted to join because I would see the commercials and be like, 'Oh, that looks so cool, ' " the younger Barrientos said.
CNN: Incentives drawing more Latinos to military, Rand study finds
On 28 December, Judge Miguel Vazquez accused Mr Barrientos, a former lieutenant, and Hugo Sanchez Marmonti, an ex-colonel, of homicide, while the other six were accused of complicity to commit murder.
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