Three Marines and a sailor were killed during combat in restive Diyala province, where operations are under way to clear the city of Sunni insurgents, Shiite militiamen and al-Qaida in Iraq fighters, the U.S. military reported Thursday.
The four perished on Tuesday, according to a military release.
Earlier Thursday, the military said a soldier was killed in a gunbattle Wednesday in southern Baghdad.
A roadside bomb killed another soldier during clearing operations in Baghdad on Tuesday, the military said.
A Marine also died Sunday in a non-combat related incident in Anbar province, west of Baghdad, the military said separately.
Identities of the dead were withheld pending notification of relatives.
War negates human nature and societal peace and harmony. H.G. Wells manifested the declaration of human rights in 1939 and wondered "What are we Fighting for?"