There are several useful purchases that 14 IPC’s allows, many of which I use quite often ~~~~
The Pain-in-the-ass:
1 transport, 1 inf, 1 art. When mastered by Naval Nations like Britain, America, Anzac, or especially JAPAN, small but effective amphib attacks can be launched, picking off lightly defended regions or occupying empty regions, which in both cases requires a recapture by enemy forces
The Eastern Front Shuck:
2 mech, 1 armor. When mastered by the land heavy powers like Germany or the USSR (even Italy), the combination of these fast moving units can move quickly to the front lines, either helping with an assault or beefing up defense
The Efficient, Fodder, But Resourceful Task Force:
2 inf, 2 art. Used by land powers with less terrain to cover, like a Med only Italy, UK (Atl. & Pac.), or China, this cheap buy provides numerous units with a moderate attack power that can help bust through an enemy stronghold, then be able to defend it with just as much power. They also help with casualty selection, keeping your air and mobile forces alive
The Pirates:
1 sub, 1 destroyer. The 2 combined have a solid attack value, especially against convoy zones. Subs alone are poor defensively, so this way your raiding parties stay alive longer, and require more units to take