The number of sniper trainee per intake (from infantry / guards
formation) is very small indeed as it's a brigade asset. Each
intake will depend on when the existing NSF snipers ORD.
One do need to complete SISPEC first to be selected. I'm excluding
those from Cdo, navel divers, SOF, Regulars, Mata units etc as i'm
not sure how they are selected.
During my time in the 90s, near to completing SISPEC, potential
candidates will be shortlisted based on certain criteria, such as,
PES status, security clearance, race (hmmm), eyesight, range score
etc (some did volunteered, so i heard). The Sniper PC gets to
interview and pick who he wants. I get to pick about 20 odd,
slightly more than my orbat strength (catering for potential out of
course personel, spares will got to other brigades to fill up their
shortage, if any). Maybe someone who ORD recently can confirm the
current selection process.
Btw, IF (a BIG if) you are thinking of signing on as a regular
sniper, think twice. Most leave the service after their first
contract or transfer to other combat vocations. There are only a
handful now, all sitting in SIW - sniper wing as instructors
...