Experience Points

Experience Points are the main focus points if leveling up - both for an NPC Soldier and a player.

Ranks
Please see here for the ranks.

Singleplayer
Kill a hostile mob -  +5 XP

Kill an enemy NPC Soldier - +15 XP

Assist a friendly against an enemy mob - +2 XP

Assist a friendly against an NPC Soldier - +3 XP

Kill an enemy NPC Soldier with a killstreak - +10 XP

Complete a quest - +30 XP

Complete a side quest - +20 XP

Complete a "Just for Fun" quest - Reward Varies

Multiplayer
Kill a hostile player -  +20 XP

Rest are the same as SP... for now.