The Orders feature originated from Brotherhood of Arms and is still one of the many things from that point of development to survive up until Invasion. The Tactical View allowed players to give orders to other teammates, witness the battlefield from above, and various other things. The Commander class is still present in Invasionbut all classes can utilize it as it morphied into a feature called Tactical View. Of course, gameplay was also shaped by the theme and art style which added in key differences. As such, it's safe to say the only thing that ever changed for Team Fortress 2 was gameplay objectives, art style, and theme. The Officer class from Brotherhood of Arms was removed, and instead converted into the Rallyflag and his morale effects became the Adrenalin power-up.

Evidence of this can be found in the leak's Source Code, in which some leftover Brotherhood of Arms code can be found. Invasion stems from none other than the Brotherhood of Arms phase of development. Originally being less World War 1 inspired with the Humans, and more retro-steampunk in design, with the Aliens looking less advanced and more primitive then seen in later concepts. At some point, the game became more focused on territory control and introduced Resources for the first time. Over time, this changed majorly when Aliens were added, and the futuristic sci-fi theme was scrapped to make way for a futuristic Humans vs Aliens, with the designs being largely Roman-inspired, despite still being futuristic.

Early in Invasion' s life, the game was much like Brotherhood of Arms in terms of classes and gameplay, but with a futuristic sci-fi theme. This iteration was more of an extended development on Brotherhood of Arms with a different theme rather than a phase entirely. It was a War of the Worlds steampunk and sci-fi inspired game featuring a war between humans and aliens. Invasion is a Team Fortress 2 pre-release design concept.

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Tf2 invasion release date