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The US military has begun flying surveillance missions over Syria, officials confirmed this week, after being given the green light by President Obama.

So what, precisely, can the Pentagon learn from these overflights 鈥� and are they necessarily a prelude to airstrikes?

While being careful not to comment on potential airstrikes, senior military officials have been increasingly vocal about the need to treat the Islamic State as a regional threat, which could involve US military action in Syria.

鈥淐an they [IS] be defeated without addressing that part of their organization which resides in Syria?鈥� Gen. Martin Dempsey, Chairman of the Joint Chiefs of Staff, said last week. 鈥淭he answer is no.鈥�

Instead, the Islamic militant group, which is now functioning as a state in a large swath of Syria and Iraq, 鈥渨ill have to be addressed on both sides of what is essentially at this point a nonexistent border,鈥� Gen. Dempsey said.聽

The US military has been conducting about 60 surveillance flights per day over Iraq 鈥� at the request of the Iraqi government, Pentagon officials are quick to point out.

But US intelligence on IS is limited. 鈥淲e are starting from a baseline of next-to-no knowledge about this,鈥� says Christopher Harmer, Senior Naval Analyst with the Middle East Security Project at the Institute for the Study of War.

鈥淲e鈥檝e got a lot of strategic-level analysis going on 鈥� a lot of think tanks, politicians, a lot of what we in the military used to call 鈥楤OGSAT鈥� 鈥� a bunch of guys sitting around talking,鈥� adds Mr. Harmer, who was a former Deputy Director of Future Operations for the US Navy鈥檚 Fifth Fleet. 鈥淏ut if you want to do something you need tactical-level intelligence.鈥�

US military surveillance flights over Syria can reveal some key specifics about IS that might allow the Pentagon to carry out air strikes, should they be called upon to do so.

鈥淎re they using the Syrian army bases that they鈥檝e taken over as points of departure for their operations, or not?鈥� says Harmer. If they are using these bases as staging centers, for example, they are a good military target. But IS leaders could be aware of this and be 鈥渋gnoring them鈥� after seizing them, he adds.

鈥淚f we are very lucky, IS would be occupying Syrian bases en mass, so you just need to bomb the base,鈥� Harmer says. 鈥淏ut I don鈥檛 think those guys are going to gift-wrap targets like that for us.鈥�

Whether IS is moving supplies by convoy, and the extent to which their fighters mix with or are separated from the Syrian population are other questions surveillance flights might help answer.

But there are a number of questions that surveillance flights cannot answer, analysts point out.聽

鈥淲e don鈥檛 really have a good idea of their internal command-and-control, questions like how are they deciding to move fighters,鈥� Harmer says. 鈥淲e have no heavy-hitting partners on the ground giving us intelligence, and there鈥檚 only so much you can figure out from the outside looking in.鈥澛�

And in order for the US military to be able to focus on gathering the relevant intelligence from the air, it must have marching orders in the form of a 鈥渃lear, comprehensive, coherent, and realistic strategy,鈥� says retired Lt. Gen. David Deptula, the principal attack planner for the Operation Desert Storm air campaign in 1991.聽

The strategy will guide the military in what intelligence it needs to gather, he points out.聽

For this reason, the object of the reconnaissance flight 鈥� which could include air strikes and intelligence-gathering 鈥� 鈥渋s only going to be realized when that power is guided by a comprehensive strategy,鈥� Mr. Deptula adds. 鈥淣o amount of kinetic force can make up for that.鈥澛�