The policy has been legally challenged several times, however federal courts have consistently found that military service members contractually agree that their term of service may be involuntarily extended.
Every person who enlists in a branch of the U.S. Armed Forces signs an initial contract with an eight (8) year service obligation. The enlistment contract for a person going on active duty generally stipulates an initial period of active duty from 2 to 4 years, followed by service in a reserve component of the Armed Forces of the United States for the remainder of the eight year obligation. Service members whose ETS, retirement, or end of service obligation date falls during a deployment are generally involuntarily extended until the end of their unit's deployment.
In a campaign speech in 2004, former presidential candidate John Kerry described stop-loss as a "backdoor draft." The use of stop-loss has been criticized by activists and some politicians as an abuse of the spirit of the law, on the basis that Congress has not declared war, such as is the case in the Iraq War.
During August 2007, Iraq Veterans Against the War, an activist organization of former and current service members, announced a national "Stop the Stop-Loss" campaign at a press conference where they were holding a week-long vigil in a tower erected on the National Mall in Washington, D.C. Other anti-Stop-Loss vigils have occurred in Bellingham, Washington, and Colorado Springs, Colorado.
On March 10 and 11, 2008, a group of college students, supported by Code Pink and Iraq Veterans Against the War, as well as several other organizations, issued symbolic stop-loss "orders" to every member of both the United States House of Representatives and the United States Senate in protest of both the practice of stop-lossing and of the Iraq War. On March 12, 2008, the students "enforced" the orders by blocking off the exits to the parking garages of the Rayburn House Office Building and the Hart Senate Office Building.
The first legal challenge to the contemporary stop-loss policy came in August 2004, with a lawsuit challenged by David Qualls, a National Guardsman in California. Qualls argued the military breached his enlistment contract by involuntarily extending his term of service. However, his arguments were rejected by Judge Royce C. Lamberth and the case was dismissed. Qualls' case was not appealed.
In October 2004, a "John Doe" lawsuit was filed by an anonymous National Guardsman facing stop-loss, challenging the validity of the law that authorized it. This suit was dismissed at trial by Judge Frank C. Damrell and the court's findings were upheld by the Ninth U.S. Circuit Court of Appeals. The Ninth Circuit also rejected another similar appeal in Santiago v. Rumsfeld in May, 2005.
The United States Army states that enlisted soldiers facing stop-loss can now voluntarily separate by request, under provision 3-12, but only after they complete an involuntary deployment of twelve to fifteen months and 90 days stabilization time (time allowed to "out-process" from the military) can they apply.
This refers to an Army policy dated Sept. 5, 2002. It allowed enlisted soldiers under stop-loss to voluntarily separate on the one-year anniversary of their original expiration of service or ETS date (under twelve-month stop-loss); officers and warrant officers, not retirement eligible, to apply to leave one year from the end of their original service obligation date; officers and warrant officers without a service obligation to request separation 12 months after they were first affected by stop-loss; and retirement-eligible soldiers to apply for retirement one year from their original retirement eligibility date (defined as 20 years active federal service) or one year from when stop-loss took effect if the soldier was retirement eligible on the effective date of stop-loss.
Despite Secretary Gates's order, by April 2008 use of stop loss had increased by 43%. Soldiers affected by stop loss were then serving, on average, an extra 6.6 months, and sergeants through sergeants first class made up 45% of these soldiers. From 2002 through April 2008, 58,300 soldiers were affected by stop loss, or about 1% of active duty, Reserve, and National Guard troops.
A film titled Stop-Loss, released March 2008, details the fictional story of a soldier (played by actor Ryan Phillippe) who went absent without leave from the military after being notified he was being "stop-lossed."