In terms of the potential financial consequences of the IRGC's new terrorist designation, some experts think it will have little economic impact.

“I think that those still doing that business -- and there are precious few non-Iranians willingly doing it -- will not be swayed by these sanctions,” Nephew told ABC News.

The questions remains, however, how IRGC forces and U.S. forces will respond to each other if they are operating in the same area.

“I hope that U.S. and Iranian commanders exercise restraint and care,” Nephew said.

Afshin Abtahi contributed reporting

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