Ascertaining the exact number of bullets carried by Marines is difficult to ascertain since it varies depending on various factors such as the mission, role within the unit, weapon type, and logistical considerations. Typically, Marines carry enough ammunition to accomplish their task and engage any potential threats.

The Marines are equipped to operate in a myriad of environments, from urban to remote wilderness locations. For instance, if they are providing security for a convoy in a high-risk area, they might carry more ammunition than if they were on a reconnaissance mission in a relatively safe area.
The type of weapon carried by Marines also determines the amount of ammunition carried. A rifleman in an infantry unit carries more ammunition than a radio operator. Machine guns are designed to provide suppressive fire and require more ammunition than standard-issue rifles. Marines carrying machine guns might require more frequent resupply.
Marines may need to carry more ammunition in remote locations where resupply is more challenging. So, typical ammunition loads vary depending on various factors. A rifleman in an infantry unit might carry 210 rounds, including seven magazines, each with 30 rounds, and an additional 30 rounds attached to the rifle. Marines carrying machine guns might carry as many as 1,000 rounds, including four 250-round belts and an additional 100 rounds in magazines for use in emergencies.
Marines carry additional ammunition for their secondary weapons, such as pistols or grenades. The quantity of ammunition carried for these weapons is determined by the specific mission and Marine’s role within the unit. In conclusion, the number of bullets that Marines carry is determined by multiple factors, but the goal is to ensure that they have enough ammunition to complete their mission and return safely.