Pentagon leaders have repeatedly voiced concerns over a no-fly zone mission in Syria, arguing Assad's formidable anti-aircraft defenses would pose a serious challenge to American and allied air power.
But those concerns seem to have fallen on deaf ears among several defense hawks in Congress.
Sens. John McCainJohn Sidney McCainVoting rights, Trump's Big Lie, and Republicans' problem with minorities Sinema, Manchin curb Biden's agenda A call to regular order: Joe Manchin and the anomaly of the NDAA MORE (R-Ariz.), Carl LevinCarl Milton LevinOvernight Defense: First group of Afghan evacuees arrives in Virginia | Biden signs Capitol security funding bill, reimbursing Guard | Pentagon raises health protection level weeks after lowering it Biden pays tribute to late Sen. Levin: 'Embodied the best of who we are' Former Colorado Gov. Richard Lamm dead at 85 MORE (D-Mich.), Lindsey GrahamLindsey Olin GrahamKyrsten Sinema's courage, Washington hypocrisy and the politics of rage Hillicon Valley: Amazon's Alabama union fight — take two McConnell will run for another term as leader despite Trump's attacks MORE (R-S.C.) and Bob MenendezRobert (Bob) MenendezDems block Cruz's Nord Stream 2 sanctions bill Overnight Defense & National Security — Differences remain between NATO, Russia Senate Democrats unveil bill sanctioning Russia over Ukraine MORE (D-N.J.) all want Obama to put military pressure on the Syrian regime by creating a no-fly zone and launching air strikes against the country's defenses.
Levin, the chairman of the Senate Armed Services Committee, said it was “essential” that the U.S. “step up the military pressure on the Assad regime.”
Dempsey reiterated the Pentagon's standing concerns on Wednesday.
"It will be difficult because the Syrian air defense system is sophisticated and it's dense," he said.
That said, "if that is a decision that the nation takes that we want to impose a no-fly zone, we'll make it happen," Dempsey added.
American military leaders have reportedly drafted strategic plans for a possible no-fly zone in Syria, located along the country's shared borders with Turkey and Jordan.
U.S. military advisers are working closely with the Jordanian military to address a number of regional security concerns, including Syria.
CIA operatives and U.S. special operations troops have also been training Syrian rebels in Turkey since late last year on using anti-tank and anti-aircraft weaponry, according to recent news reports.
Defense Secretary Chuck HagelCharles (Chuck) Timothy HagelInterpreter who helped rescue Biden in 2008 escapes Afghanistan Overnight Defense & National Security — Pentagon chiefs to Congress: Don't default Pentagon chiefs say debt default could risk national security MORE also recently approved a request from Amman to keep a detachment of Air Force F-16s and a Patriot anti-aircraft missile battery in Jordan.
Earlier this year, then-Defense Secretary Leon Panetta ordered a Patriot missile battery to be deployed along Turkey's border with Syria.