Terrorism. Part-One.

Improvisation.

Terrorists usually operate with light arms, RPG's (Rocket Propelled Grenade Launchers), SAM's (Surface to Air Missiles) and occasional Cannons up to 23mm calibre. But some are more than a small group and could be described as a little army. 

ISIS/ISIL Now come into to join the PLO, Hezbollah, FARC and the Al-Quida/Mujaheddin-Taliban.

Many of these groups have commandeered existing occupation military equipment and have adapted it to suit their own environments such as Libya, Somalia and Iraq/Syria. From Toyota pickups to heavy armour are being converted or worked down, rather than reinforced.