mpcheat god              God mode
mpcheats ghost           Ghost mode
mpcheats changeclass *   Weapon change using the list below
mpcheats class rpg       Get The Missile Launcher

Replace * with one of the following names:

r         M16A2
g         M16A2.203
s         M82A1
s24       M24.SWS
ar        M249.AR
ak        AK47
gp        AK47.GP30
ak74su    AKS74.SU
svd       DRAGUNOV.SVD
mos       MOSIN NAGANT
rpk       RPK 

Thanks to Revolution readers Charles Moon, ????, and dude1548 !