A civil rights watchdog group is crying foul over a "God bless the military" sign at a Hawaii Marine Corps base, claiming the display violates the U.S. Constitution.

The Military Religious Freedom Foundation sent a message to Marine Corps Base Hawaii commanding officer Col. Sean C. Killeen asking that the sign - which says "God bless the military, their families and the civilians who work with them" - be moved to the chapel grounds or removed from the base.

The nonprofit advocacy group alleges that the sign is a “brazen violation” of the Establishment Clause of the Constitution, which forbids the government from promoting one religion over another.

"MCBH will exercise due diligence to ensure compliance with existing regulations and law, including the Establishment Clause of the U.S. Constitution," Capt. Tim Irish, spokesman for the base, said in a statement.

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