HSC, as is the usual, is in flux, but here goes....While we're at it, can anyone here answer that question with respect to HSC community?
FRS for 6-8 months
1st tour - 3 years
Shore tour - FRS, Weapons School, HTs, VTs, TPS, PEP, ROTC, "other"
Disassociated Tour, sometimes with an IA kicker
*somewhere in here make O-4*
FRS again
DH Tour, assuming you screen
2nd Shore Tour - as others have stated
*command/O5 screen somewhere in here*
FRS again
XO/CO Tour
That's the standard route. You can move between HSC(exp) and HSC(CVW) for your fleet tours. HSC(exp) DH screening has not been good as of late, but that'll change. Timing can be weird due to getting your masters before flight school, etc, so your first sea or shore tour may be cut short in order to get you back in the timing gates for O-4.