Memes

I'm just worried for the troops. The fuckers sending them are ultimately responsible, but the troops should have been warmed not to expose themselves to danger like this.

Operational Security. I.e. securing information related to deployments, plans, attacks, strikes, etc etc etc.

Controlling access to any information that could be used to gain intelligence on troop/ship movements, locations, timing, etc.

For an older example, here's a cartoon short about one Private Snafu.