In Contra: Rogue Corps for the Nintendo Switch, the game saves automatically at certain checkpoints or after completing a level. There is no manual save option. To ensure your progress is saved, make sure not to exit the game abruptly or turn off the console during gameplay. It's best to reach a checkpoint or complete a level before exiting. When you return to the game, it should load your most recent save automatically, allowing you to continue from where you left off.