Phone your unit about submitting your cert first, if you'd
obtained it separately from ICT (eg. went back for FFI or medical
review). Then it's up to your CO on whether to call up for the next
ICT. If you don't & report as usual, you may still have to go
outfield (depending on injury), & then it's up to your own
commander & buddies to decide how best to accomodate you.
Be aware that if you manage to defer, you may have to do a make-up
ICT (with another unit) within the same workyear.