After completing the game, save it and load your saved data to start a new game with the following benefits:

BONUS - DESCRIPTION
Character Stats - Retain EXP, money, weapons and levels that you have gained on your previous excursions.
Hard Mode - Hard mode is now unlocked for skirmishes.
Mission Replayability - All storyline missions can be replayed.
Music Tab - Music is now unlocked.
Statistics Tab - You can now see the statistics of the missions.