Sgt. 1st Class Nathan Ross Chapman[?] of San Antonio, Texas, was killed in an ambush in eastern Afghanistan, the first U.S. soldier to die by hostile fire. A CIA operative was also wounded.
Seven U.S. Marines are killed when their plane hits a mountain while landing in Pakistan. In the first three months of the campaign, 15 U.S. personnel have died.
... do not release oxygen. One significant group of such organism are bacteria which use hydrogen sulfide instead of water in their photosynthetic pathway:
CO2 + 2 H2S ...