For example, line battalions are unable to land via transport planes. Keep in mind that not every force can be used as a paradrop force. One of the HOI terms you’ll hear quite a bit is “paradrop.” This refers, of course, to you dropping your paratroopers into enemy territory. Wondering how to use paratroopers in HOI4? Keep reading to discover our comprehensive guide! All About the Paradrop And that means mastering how to use paratroopers. Even if you are a master of ground combat, your global plans mean you’ll need to master dropping forces into other countries. The biggest example of this is the airdrop. In order to win, whether against the AI or human opponents, you must learn to balance your assaults between different kinds of attacks. Hearts of Iron IV is a game all about balance.