field manual Combat in fortified areas and towns. - USA Voorschrift, Field Manual, 31-50 Special Forces commander's manual for MOS 11B (SQI S) / Headquarters, Department of the Army - USA Field Manual, FM 31-11B-S/CM Operations against airborne attack guerilla action and infiltration. - USA Voorschrift Field Manual 31-15 Special Forces soldier's manual for MOS 11 B (SQI S) / Headquarters, Department of the Army - USA Field Manual, FM 31-11B-S