Wizzy......
Obviously you didn’t get up to the Top End in the 80's - 90's.
It was a Government Campaign to rid Brucellosis from the country. The disease was spread by introduced wild critters, mainly Buffs....there were many 100,000's of them shot from a swarm of helicopters, normally with a 7.62 SLR [Ex Aussie Military standard issue]
Pigs and camels were also targeted, but can't recall if they spread that disease or something else.....
BTEC = Brucellosis ??????? Eradication Campaign [If I remember correctly].
Merry Xmas.