Well I was reading a book about B-24 Pilots and I have found the origins of the Liberator, its basically a World War II bomber, and the pilots did call the Liberator the Lib similar to Planetside. Alot of you probably knew this already but its still kinda cool. Since I have found out what alot of Planetside Vehicles and Weapons were based off of. Here is a picture of the Real Liberator:
The Lib in Planetside is far diffrent in concept and in design from the real world the Liberator was a mammoth and hard to move and it was a carpet and cluster bomber and had the biggest bomb payload of the war. Similar to Planetside it does carry lots of ordinance and can take alot of damage as it did in the real war.
Just thought you guys would find that interesting, ill see what else I can dig up about Planetside Vehicles.