Different unit is different. You can't ask a general question like that. I presume this is your first ICT? If unsure best is bring everything. Better then kena **** and sent home to take.
For my first ICT I brought everything. Turned out there was field exercise so indeed we needed SBO, field pack and helmet. And they did check all the field pack items!
So second ICT I brought everything again. This time round no field camp. By this time I made friends with some lao jiao. Mine is evergreen unit so good thing is always will have lao jiao around.
Lao jiao told me this unit day 1 no need to bring. After in-pro sure will give the ICT plan so you can see got field exercise or not. If have then next day you bring. If don't have then no need.
Good advice. That's what I did for my 8 other ICTs. Turned out all no field exercise.
But like I said, different units are different. Since this is #1 for you I suggest you don't risk it.