Which of the following types of ammunition typically does not have powder bags needed for firing?

Fixed artillery ammunition is designed as a complete round that includes the projectile, propellant, and primer all assembled together in one unit. This design eliminates the need for separate powder bags because the propellant is contained within the cartridge case itself. When the fixed round is loaded into the cannon or howitzer, it can be fired without the additional step of adding powder bags, which simplifies the loading process and reduces the logistical burden on the crew.

In contrast, artillery ammunition and semi-fixed artillery ammunition typically require separate powder bags. Artillery ammunition might use a combination of bagged powder alongside the projectile to allow for adjustments in the charge for different firing distances or conditions. Semi-fixed ammunition involves a setup where the propellant is in the form of a bag but is connected to the projectile, meaning that the crew still needs to handle powder bags.

Light ammunition generally refers to smaller caliber ammunition used in small arms and does not pertain to artillery in the same context, nor does it typically deal with the concepts of powder bag separation as seen with large caliber artillery rounds. Therefore, fixed artillery ammunition stands out as it does not involve powder bags for firing.