The drug cartels not the only problem.  - El Salvador
1982-91 33,274 M16 assault rifles 
1981-91	3,120 40mm grenade launchers 
1982-91	267,000 hand grenades
Lebanon
1980-83	38,000 M16 assault rifles 
1983-84	60,000 hand grenades 
1983-84	120,000 81mm HE mortar rounds 
1983-83	2,944 anti-personnel mines 
1984 4,000 anti-tank mines
Somalia
1982-87	4,800 M16 assault rifles
Thailand
1980-90	347,588 hand grenades 
1980 185,000 anti-personnel mines 
1980 40,000 anti-tank mines
Zaire
1988 1,000 M16 assault rifles - 
https://fas.org/asmp/library/reports/AAAS.htm