They could be after a specific person in the Pentagon. Maybe a rogue agent who has stolen some important data related to the Avengers and is planning to sell it. So, they break in to stop this from happening.
Pentagon Wars isn't strictly true. It takes some liberties and dramatizes aspects to make for a more engaging narrative. But it does draw inspiration from real events within the defense industry.
It's based on real events to some extent. But like many such stories, there might be some dramatization and creative elements added for narrative purposes.
It might have made the public more aware of the internal workings and potential problems in the Pentagon. People could see that it's not a seamless, perfectly - functioning entity.
Adventure is also quite common. They are often put in situations where they have to fight or explore together, like in a lot of fanfics where they go on quests. For example, in some stories, they might be searching for a lost artifact. This allows for a lot of action and character development as they face different challenges during the adventure.
The 'Pentagon Wars' was about the mismanagement and problems in the development of military projects within the Pentagon. It involved issues like cost overruns, delays, and inefficiencies in getting military equipment developed. For example, the development of some weapon systems took much longer and cost far more than initially planned due to bureaucratic red tape, lack of proper communication between different departments, and over - ambitious designs.
The Pentagon Wars' true story reveals a lot of problems. In the Pentagon, there were issues with how contracts were awarded and managed. There was a lack of proper communication between the military personnel who would actually use the equipment and those in charge of procuring it. For instance, a new military technology project was initiated without fully considering the practicalities of its use in the field. As a result, the equipment developed was not as useful as expected, and huge amounts of money were spent on it, causing a strain on the military budget and hindering the overall military preparedness.
In a fanfic where the Avengers break into the Pentagon, it could be for a number of reasons. Maybe they suspect the Pentagon is hiding some dangerous alien technology that could fall into the wrong hands. They might use their unique skills to bypass security. For example, Black Widow could use her espionage skills to disable alarms, while Iron Man could hack into the security systems.