BloodFX mod from Merciless v.6, place z_mc_bloodfx_v6.pk3 in the same folder as AWE:COD to add extra blood
for the clients who have it installed.

For the full Merciless experience I recommend trying the excellent Merciless mod by Chris_P.

For more information about Merciless go here: http://www.mercilessmod.com/