A. Yes
B. With multinational _support_ if available, however we should go it alone if not. Note that, as Iraq is in violation of the cease-fire agreement multinational support/ UN support is not required for hostilities to resume. Also, I'm talking about verbal support from states in the region, frankly the soldiers of any other nation besides the UK would just get in our way.
C. Not sure where the US would get assassination squads... maybe Iran would loan us some.
USAF should conduct deep strikes against Iraqi C3I and targets of military importance. Damage to civilian infrastructure, even dual-use structure, should be minimized to facilitate governance of the country after hostilities have ceased.
US Army armored forces should attack out of Kuwait (after US removes all US military forces and support from Saudi Arabia) with USAF close air support.
USMC should sieze port facilities in Iraq and conduct riverine operations in conjunction with the US Coast Guard and US Navy special operations forces to secure navigable portions of Tigris and Euphrates rivers as supply corridors.
USN should provide close air support, naval gunfire support and logistical transport of afloat prepositioned equipment.
US Special Operations Forces should seize stratiegic locations, airfields, suspected special weapons sites. Assets of civilian importance should also be secured to prevent their destruction.
US Coast Guard should provide green-water support and expert advice for port seizure, riverine and coastal operations, and port security forces for ports in Kuwait and seized ports in Iraq.
D. Removal of current power structure by any means available. Emplacement of a temportary government, with representation of all opposition elements in Iraq, similar to what was done in Afghanistan. If members of the current regime surrender or are captured, and have no criminal actions pending, they should be allowed to live in any nation that will accept them. US Army and National Guard forces provide critical civilian support services (medical, water, food distribution). US Army Corps of Engineers repair and rebuild civilian infrastructure. US Army Special Forces and US Army Reserve training battalions train and equip new Iraqi national army.
E. Individual Arabs will blow more of themselves up. Neignhboring Arab states will express outrage, while really being quite relived.
Peacniks around the world will smugly assert their moral superiority over the knuckle dragging warmongers from the safety of their flowergardens . US-bashing in the UN will increase from states who are happy to accept the strength and support of the US when it suits their purposes, and just as happy to demonize the US when it looks good at home.
US families will mourn their honored dead. The US military will rest, repair, refit... and then continue training for the next time.
“I am a soldier. I fight where I am told, and I win where I fight.”
General George S. Patton, Jr.