Spc. Wooster Rancy is being held in pretrial confinement as he awaits a preliminary hearing on charges of murder and obstruction of justice.
Three U.S troops were killed and at least another 40 were wounded in Sunday's attack on the Tower 22 base.
A federal judge has sentenced a Texas woman to 30 years in prison for helping to dispose of the body of U.S. soldier Vanessa Guillén.
Private Ana Basaldua Ruiz was found dead on base one month ago.
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