Remember that you may not need every man every time. There are no rules saying you have to have a full complement of eight men per mission. You may want to save some of your men for later missions. As in real life, if you get a man injured, fatigued, or killed, he will remain that way for the next mission. You can let a man rest for one mission and he may be better for the second one out.
Dead men are dead and unable to resurrect, just as in real life.
Planning Tips Plan an escape route for each team. They will follow the path you set for them and then just stand there in the open. They don't know to run to a recon point unless you tell them to. Go back to Clear or Engage. Be sure your best men are the leaders of the teams.