Straps
one of the most useful functions I've found from the medical services is the old eye washout. Underrated by most, it certainly refreshes the eyes that might have copped a bit of smoke, and certainly stops the old red gritty eyes next day.
As for who, what or when..... if I want my eyes washed out, then St Johns are fine. If I hurt myself....please send for SAAS. When should they be there??....well...we send an ambulance to any going house job on standby....don't see the difference (injury wise speaking) from that or a second alarm grass/scrub fire, put them somewhere close by and have them wait.