that type of surgical tape is good.. but sometimes in camp,
can't find the correct type of tape.. so like i said, when push
comes to shove, and need that kind of protection for your feet,
i've found that there's aways masking tape in the camp

that part of the SAF doesn't seem to have changed from my time
as an NSF in the early 90s to the last ICT i went to.. there was
always rolls of the stuff lying around 
I just go to Guardian or Watsons to buy enough for a few route
marches at one time, then try to stock them up once in a while. I
suffered for a few route marches (including the hellish 24km BMT
march when I got 6 or 7 big blisters on each sole) before reaching
this solution.
Remember the first march I had with foot bandaged up well
think I flew!
edit: of course, masking tape around the feet is better than
nothing!