pre-breath in spacesuit for CEV crew?

[carp]

Before the launch the astronauts of CEV will have to make pre-breath closed in theirs spacesuits like in the missions Apollo?

 

[gunsandrockets]

"No, the CEV will be a nitrogen/oxygen atmoshpere at sea level pressure."<br /><br />??<br /><br />Sea level is what, about 15 pounds per square inch? I thought the CEV and LSAM are going to run at 9.5.

 

[darkenfast]

I believe the CEV will run at sea-level pressure for missions to the ISS, but at about 9-something psi for lunar missions to avoid rigorous pre-breathing regimes.