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The operation that involved Marines being sent to Panama in 1989 is known as Operation Just Cause. This military operation was conducted in December 1989, aimed at depose the Panamanian leader Manuel Noriega, restore democratic governance, and safeguard U.S. citizens residing in Panama. The operation involved a significant number of U.S. forces, including Marines, and was executed swiftly to achieve its objectives.

In the case of the other options, Operation Enduring Freedom refers to the military operations in Afghanistan following the September 11 attacks in 2001. Operation Desert Shield/Storm pertains to the actions taken during the Gulf War in 1990-1991 against Iraq’s invasion of Kuwait. Finally, Operation United Shield was focused on the withdrawal of U.N. forces from Somalia in 1994. Each of these operations took place in different contexts and locations, which further highlights the distinct nature of Operation Just Cause in the late 1980s in Panama.