I've seen stats that 137 American Soldiers were KIA in April. Where is your source stating 174?
Bloomberg News Service (see post above). Maybe that Bloomberg report is wrong. Either way, the number is tragically high.
April is Iraq's deadliest month
By Gregg Zoroya, USA TODAY
The deadliest month for U.S. troops in Iraq ended Friday with 137 servicemembers having lost their lives. The overwhelming majority of them were victims of hostile action such as gunfire, rocket attacks and explosions.