Army = RP
Navy = Sea Soldier
Airforce = FDS
Basically all 3 will take a combined RP course it was 6 weeks for my batch, after which the army folks will stay and the other 2 are posted to their respective bases. For airforce and army it is additional 2 weeks and for navy it is additional 12 weeks.
You will be doing some basic infantry training at clementi (if you survive BMT then you will survive this no problem).
My experience at clementi was super slack compared to BMT, fitness drop like mad, so dont worry. And for the sea soldiers, glhf you will have to go through another we 12 weeks of trainee life and it is very regimental.
I don't wanna post too specific detail regarding training cause they actually monitor all these online activity