Not Vietnam

Link:

The first part of April has been the bloodiest period so far for U.S. troops in Iraq. There were 87 deaths by hostile fire in the first 15 days of this month, more than in the opening two weeks of the invasion, when 82 Americans were killed in action.
"This has been some pretty intense fighting," said David Segal, director of the University of Maryland's Center for Research on Military Organization. "We're looking at what happened during the major battles of Vietnam."
The last time U.S. troops experienced a two-week loss such as this one in Iraq was October 1971, two years before U.S. ground involvement ended in Vietnam.