Attributes . MIL-C-81511 Series 1/Class A,E,F, MIL-C-81511 Series 1/Class C,P,T, MIL-C-81511 Series 2/Class A,E,F, MIL-C-81511 Series 2/Class C,P,T, MIL-C-81511 Series 3 & 4/Class A,E,F, MIL-C-81511 Series 3/Class A,E,F, MIL-C-81511 Series 4/Class A,E,F . Names