For Strategems Always grab the Strategems That you are good at Or support Strategems Example,

One of the three Shields My favorite for team play,
SHIELD GENERATOR RELAY or
DIRECTIONAL SHIELD,

As both provide better cover for team mates Since the SHIELD PACK Can only protect one person.

And the RECON VEHICLE Is great for getting around with friends or divers As it has speed and weaponry.

Now for Firepower I would recommend The EAT-17 EXPANDABLE ANTI-TANKS Because it has Two EAT'S.

And for Weapons You can never go wrong With a STIM-PISTOL with is pretty self explanatory On why.

And the most important, Communication and being Cooperative A well communicated team Is a strong one.

Now happy dives Helldivers. And do not forget Cooperation.