The last U.S. soldiers left Iraqi soil early on Sunday, signaling the conclusion of an almost nine-year-long military intervention.

Begun in 2003, the most recent Iraq War resulted in the deaths of nearly 4,500 Americans and tens of thousands of Iraqis. In financial terms, one U.S. Congressional Budget Office estimate indicates it either has or will cost taxpayers about $1.9 trillion.

The final convoy of troops left Camp Adder, near Nasiriyah, most in mine-resistant ambush-protected (MRAP) vehicles.

Check out this slideshow marking the departure of U.S. armed forces:

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U.S Withdraws From IraqFinal Moments Through Photos
Soldiers from the 3rd Brigade Combat Team, 1st Cavalry Division, smile while posing for a photograph during the wait at a staging area in Camp Adder to be part of the last U.S. military convoy to leave the country near Nasiriyah on Sunday. REUTERS/Lucas Jackson/Pool
U.S. Withdraws from Iraq Final Moments SLIDESHOW
Sgt. Kilwe MuDiwa, left, and Spc. Jamaal Little John from the 3rd Brigade Combat Team, 1st Cavalry Division, look at a photograph of themselves outside of an MRAP vehicle before departing Camp Adder as part of the last U.S. military convoy to leave the country near Nasiriyah on Sunday. REUTERS/Lucas Jackson/Pool
U.S. Withdraws from Iraq Final Moments SLIDESHOW
A soldier from the 3rd Brigade, 1st Cavalry Division, carries a duffel bag at the nearly deserted Camp Adder, now known as Imam Ali Base, near Nasiriyah on Friday. REUTERS/Mario Tama/Pool
U.S. Withdraws from Iraq Final Moments SLIDESHOW
U.S. Air Force Tech. Sgt. Joesph Cook smiles as he waits to board the last Air Force flight out of Ali Air Base near Nasiriyah, en route to Kuwait on Saturday. REUTERS/Shannon Stapleton
U.S. Withdraws from Iraq Final Moments SLIDESHOW
U.S. Air Force Senior Airman Janna Less, center, 23, smiles as she sits on the last Air Force flight out of Ali Air Base near Nasiriyah, en route to Kuwait on Saturday. REUTERS/Shannon Stapleton
U.S. Withdraws from Iraq Final Moments SLIDESHOW
U.S. Air Force airmen sit on the last Air Force flight out of Ali Air Base near Nasiriyah, en route to Kuwait on Saturday. REUTERS/Shannon Stapleton
End of the Road for America in Iraq
America officially closed a costly war that raged for more than nine years, killed some 4500 U.S. service members and dried out hundreds of billions from the United States Treasury. REUTERS/Caren Firouz
U.S. Withdraws from Iraq Final Moments SLIDESHOW
U.S. Air Force senior airmen are greeted after landing in Kuwait following the last Air Force flight out of Ali Air Base in Iraq on Saturday. REUTERS/Shannon Stapleton
U.S. Withdraws from Iraq Final Moments SLIDESHOW
U.S. Air Force Tech. Sgt. Jakob Bassell of the 447th Expeditionary Logistics Readiness Squadron, one of the last units to leave Baghdad, smiles as he arrives at the U.S. Air Force base Ali Al Salem near Kuwait City, Kuwait, on Saturday. REUTERS/Shannon Stapleton
U.S. Withdraws from Iraq Final Moments SLIDESHOW
A U.S. military officer removes his weapon upon entering Kuwait during the withdrawal from Iraq on Sunday. REUTERS/Caren Firouz
U.S. Withdraws from Iraq Final Moments SLIDESHOW
U.S. military officers welcome vehicles entering Kuwait during their withdrawal from Iraq on Sunday. REUTERS/Caren Firouz
U.S. Withdraws from Iraq Final Moments SLIDESHOW
A soldier gestures as he crosses the Iraqi border into Kuwait earlier this month REUTERS
U.S. Withdraws from Iraq Final Moments SLIDESHOW
Kuwaiti and U.S. soldiers close the border gate after the last vehicle crossed into Kuwait during the U.S. military's withdrawal from Iraq on Sunday. REUTERS/Caren Firouz
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