Operation Coronado was a series of 11 operations conducted by the American Mobile Riverine Force in conjunction with various units of the Army of the Republic of Vietnam in the waterways of the Mekong Delta in the south of the country in an attempt to dismantle guerrilla forces and infrastructure of the Vietcong in the waterways of the Mekong, which had been a communist stronghold. The operations ran sequentially from June 1967 to July 1968.