November, 1983. A National Security Directive states that the U.S would do "whatever was necessary and legal" to prevent Iraq from losing its war with Iran. [1] & [15]
October, 1983. The Reagan Administration begins secretly allowing Jordan, Saudi Arabia, Kuwait, and Egypt to transfer United States weapons, including Howitzers, Huey helicopters, and bombs to Iraq. These shipments violated the Arms Export Control Act. [16]
December 20, 1983. Donald Rumsfeld , then a civilian and now Defense Secretary, meets with Saddam Hussein to assure him of US friendship and materials support. [1] & [15]
July, 1984. CIA begins giving Iraq intelligence necessary to calibrate its mustard gas attacks on Iranian troops. [19]
And here's a good one:
March, 1986. The United States with Great Britain block all Security Council resolutions condemning Iraq's use of chemical weapons, and on March 21 the US becomes the only country refusing to sign a Security Council statement condemning Iraq's use of these weapons. [10]
May, 1986. The US Department of Commerce licenses 70 biological exports to Iraq between May of 1985 and 1989, including at least 21 batches of lethal strains of anthrax. [3]
May, 1986. US Department of Commerce approves shipment of weapons grade botulin poison to Iraq. [7]
There's a complete chronology of US involvement in Iraq which explains the truth behind the chart you offered.
You can find the facts here
I would also dispute the reenlistment statements you make regarding returning soldiers in the US, as many reports exist which categorically state that the US military has been unable to meet its enlistment targets.
Also consider the plight of a soldier, after four years of active duty, having been indoctrinated to fight and having known the 'thrill' of live combat, on returning to their poor, unemployment-ridden home town, where they can't find anything equal to that excitement, what are they going to do?
Like any kind of addict, some go back for another fix.