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EQUIPMENT
While you are gearing up and familiarizing yourself with your men, the key thing you should be discussing is equipment. Inspect them, make sure every Marine has what they need. Medical supplies, extra ammo, a backpack. Either yourself or an FTL should be equipped with a RADIO TELEPHONE PACK.
Do your CTs have extra materials? While you're at it, fill an IMP Backpack with metal to lug groundside, or more magazines!
You probably have 3 HMs, do they all have redundant equipment? Do you have one that's better equipped for in depth casualty care, one better equipped to fight alongside the RFN? Organize them accordingly. This applies to CTs as well, it's not a bad idea to see if you have an HM or CT who can be relied on in the front assuming you have other HMs and CTs.
Does your Autorifleman need help carrying ammo? This is possibly the most important member of your squad if employed properly, do not let them dry out.
One of the most important things to check on is what Power Weapons does your unit have at their disposal. Has someone taken the Flamethrower to ensure proper defoliation? Does REQ have spare Heavy Machine Guns or Rocket Launchers? Make sure every Rifleman has an opportunity to get this special equipment and know who has what.
Make sure your squad has redundancies, multiple individuals with barricade equipment, multiple sets of tools, make sure everyone has at least some kind of illumination equipment.