Jack L. Jones served five tours in Vietnam. His first tour was in 1960 with Military Assistance Advisory Group (MAGG). He returned for a second tour in 1963 with 1st Special Forces Group (1st SFG (ABN)) to the II Corp area. Jones’ third tour was in 1964 with 1st SFG (ABN) assignment unknown. His fourth tour was in 1967 with Military Assistance Command Vietnam Studies and Observations Group (MAC V SOG), Camp Long Thanh (B-53) and later transferred to 5th SFG C-4. Jacks last tour was in 1969 with 5th SFG (ABN) assigned to the Recondo School at Nha Trang.
In 1967, Military Assistance Command Vietnam Studies and Observations Group (MAC V SOG), OPS-35 (Ground Reconnaissance) Program was expanded. With the additional personnel, MAC V SOG’s House 50 (Supply Office / S4) requested the Counter Insurgency Support Office (CISO) to procure additional SOG knives.
Conrad “Ben” Baker redesigned the knife with a larger cross guard and more refined blade. With the loss of the first batch of Fat Guard SOG knives during the logistic process he also requested the knives be individually numbered on the ricasso that start at 1 and continue through 3700. The initial batch of knives had variations in the tempering process from an almost parkerized black, to blued, and other versions of a plum color. The number system started out as hand stamped and the ladder were acid etched. I have encountered two different stylized versions of the acid edge design.