Two U.S. Marines killed during a `` hostile incident '' in southern Afghanistan . The forces are trying to gain and hold ground in the perilous region ahead of national elections this August . 4,000 Marines , sailors working to clear Taliban militants from Helmand river valley . British forces launched a similar offensive in the province in late June . Comment:
Two U.S. Marines killed during a `` hostile incident '' in southern Afghanistan . 4,000 Marines , sailors working to clear Taliban militants from Helmand river valley . British forces launched a similar offensive in the province in late June . Comment: