BASE ASSAULT MISSION
A Base Assault is where one team’s objective is to defend a base. Normally a building, flag, or some other landmark such as a hilltop. It is one team's job to protect the base and keep the enemy out of that base. The other team's function is to take control of that base in the set time frame. One team is led to the pre-determined base and gets ready for the assault. The other team is taken away to its entry point. Each time is given a set number of re-spawns or replacements, typically the attackers get one re-spawn per player in their team and the defenders 80% (for example a defending team of 20 players would get 16 re-spawns). The number of replacements can be changed to take into account how easily the base is defended or attacked. You want to try and keep the mission open, and winnable for both teams.
In this mission once a team has used their quota of re-spawns the players that die after that time remain dead until the end of the mission. This ensures that the end of the mission is very open and exciting. The winner is decided by whichever team controls the base or has the most living members in or around the base (typically 5 metres of the flag).