Slap, what you go after depends on what you want to accomplish. First strategic question: what is the objective? Follows from; what is the US interest? Then there is the Clauswitzian question: what kind of war are you embarking on?

Last first: intervention in a sectarian war involving Iran as a support and through proxies. The US interests are to (1) weaken Iran and its proxies; (2) demonstrate the high cost to Russia of supporting a criminal regime; (3) protect the people of Syria to the extent possible given that we have failed to do so for over 2 years. Objectives: (1) make the use of chem weapons so costly that they will not be used again; (2) weaken Assad to the point where the rebels have a chance to defeat him (that means hurting the regime and therefore its allies); (2) strengthening those elements of the opposition that are most supportive of US goals in the region.

Rings: (1) degrade C2 especially that of the AF. (Leadership but limited); (2) Crater airfields (infrastructure); (3) destroy Syrian AF (deployed mil forces). If you look at this I am following the lead of GEN jack Keane

Cheers

JohnT