AcBCD... Etc. (TNCC is really helpful, I'll echo this fact).
And honestly, it depends on your hospital's protocol/system and resources (Level 1, Level 2...) and HOW BAD/WHAT KIND of trauma you are receiving. Is it a burn? Is it a penetrating? Blunt?
If it's really bad and that patient is circling the drain on the table, and you're the primary nurse, you might be directing someone to run to blood bank with the non-crossmatched papers for your O neg or O pos blood, or you might be dealing with titrating a pressor, or hey, you could be looking for a third line in a limb that isn't burned to a crisp while pressure bagging a few liters in your other peripheral lines while a doc is hopefully putting in a central line, or you could be calling out the numbers on your monitor to someone who's hopefully charting for you (generally on a bad trauma you'll get at least 3 other RNs helping, plus a slough of gawkers/runners, at least you hope). You might help encourage closed-loop communication among ortho/trauma surgery/cardiothoracic/ED physician team. And you might be doing all of these things at once. All while helping maintain AcBCD....etc.
If it's a minor car accident "hey we're not gonna take off the c-collar until your x-rays are back" kind of thing, yeah, that's different than a 65% TBSA partial and full thickness burn with bilateral tib-fib fxs, obvious femur deformity, systolic of 86/p on scene, unstable pelvis, tubed, and a positive FAST exam. Very different. But the methodology is the same. I guarantee that second patient is going to the OR, while the first patient is someone you have to monitor "just in case" (and one of my "just in case" folks ended up having a basilar skull fracture... hence we use the TNCC methodology).
The interventions are pretty standardized. Your equipment and system may vary, and the intensity of intervention may vary, but it's the same systemic assessment in the same order for a reason. When you get something really bad and you're focused on the alphabet, it pulls you back into your job and you don't freeze. There have been some traumas that have made me drop my jaw. There are some I've seen where I've cried uncontrollably in the bathroom 10 minutes after that patient has gone to the OR and it's all over (kids - you see people do some horrible things to one another, and when kids are abused it really gets to me). But in the moment, I follow what needs to happen and do what's best for the patient, which is dictated by TNCC and the AcBCD pneumonic
(Airway/c-spine, Breathing, Circulation, Disability/Deformity, Expose/Environment, Full set of Vitals/Fucntional Adjuncts/Family, Give Comfort, Head to Toe, Inspect the back)