Baghdad, Iraq ? A Sunni Arab coalition submitted its list of candidates for the December election Friday, joining other political factions in the race and signaling greater Sunni participation in a process Washington hopes will help speed the day when U.S. soldiers can go home.

The U.S. command announced that five more American service members were killed in Iraq, indicating the challenges still facing the U.S. and its partners as this country approaches a decisive stage in its political development. It has been six months since Iraq’s government took office April 28.

At least 16 coalitions as well as an undetermined number of parties and independents met the Friday deadline of filing for the Dec. 15 election, when voters select a 275-member parliament to serve for four years.

It will be the first full-term parliament in Iraq since Saddam Hussein’s regime collapsed after the U.S.-led invasion in 2003.

The election follows the Oct. 15 ratification of the new constitution, which many Sunni Arabs opposed. Despite the failure of Sunni Arabs to block the charter, the decision by a Sunni coalition to participate and the presence of prominent Sunnis on other tickets indicated that many members of the community, which forms the core of the insurgency, have not abandoned the political process.

Political battle lines, in fact, have been drawn as before along ethnic and religious lines, a development that complicates nation-building in this factious, war-ravaged country of 27 million people.

Pigeons fly over the Shrine of Al Kadmea as faithfuls gather for Friday prayers in Baghdad, Iraq. An alliance of major Shiite religious parties, which swept Iraq's historic election in January, has agreed to remain together to contest next month's parliamentary ballot.

The major blocs include a Shiite alliance built around two religious parties with ties to Iran, a broad coalition led by former Prime Minister Ayad Allawi, a secular Shiite, and the Sunni Arabs.

Allawi’s ticket includes several prominent Sunni Arabs, including Vice President Ghazi al-Yawer and Sunni elder statesman Adnan Pachachi, as well as the communists.

The U.S. military said an Army soldier died of injuries suffered Thursday when his patrol hit a roadside bomb in Baghdad. When other soldiers arrived, a second bomb exploded, killing another soldier, the military said.

In Saqlawiyah, 45 miles west of Baghdad, two Marines assigned to Regimental Combat Team 8, 2nd Marine Division, II Marine Expeditionary Force (Forward), were killed Thursday by mortar or rocket fire, the military said.

That same day, an Army soldier assigned to the 2nd Marine Division, II Marine Expeditionary Force (Forward) was killed when his vehicle was hit by a roadside bomb explosion in Ramadi, 70 miles west of Baghdad, the military said.

At least 2,010 members of the U.S. military have died since the Iraq war began in March 2003, according to an Associated Press count.