An ex-Marine who survived dangerous patrols in Iraq and Afghanistan is now “chained to a bed” in a notorious Mexican prison after a road trip to Costa Rica went terribly wrong, his friends and family say.

A chorus of supporters are calling on the Mexican government to release Jon Hammar, 27, who was jailed in August for carrying an antique shotgun that he believed could be legally registered in Mexico.

Hammar, of Palmetto Bay, Fla., was headed to Costa Rica for a surfing trip to try and recover from post-traumatic stress after four years of combat in Iraq and Afghanistan.

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