Call of Duty is a long and storied series. People have been heading off to wars, stepping into the shoes of soldiers, and taking up arms since the original installment arrived in 2003. Now, with the future drawing near, we have seen our first online-only entry with Black Ops 4 and have even heard rumors about the series heading to Vietnam. While we think about what the future could bring, let's think back on some of the more recent installments that have kept the series exciting.