HALO-is a military acronym for High Altitude Low Opening referring to military freefalling. 

It is an insertion technique used for clandestine insertion into denied areas of interest. 

The operative exits an aircraft from twenty thousand feet or higher and freefalls to about one thousand feet before opening their parachute.Jeffery Barkil is a young soldier who upon

completing his training as an Airborne

Ranger is recruited by the CIA. 

After completing six months of their special

training on running Black Operations, he is

sent to Southeast Asia.  The story takes

place during the years 1958 and 1961, a

period between the French surrender and

expulsion from Vietnam and the US

admitting they had troops in the country.

HALO

Sergeant Barkil takes you on eleven

harrowing missions including his time as a prisoner of the Viet Cong.  You are taken from one mission to the next as Sergeant Barkil comes to terms with being a hired assassin while at the same time carrying out his missions and fighting to stay alive.