Kindly post the link of the said advert, so I can see the concerned material and guide you accordingly. I checked the site but was unable to find a relevant ad.
Oh and work on your attitude a bit, the Armed Forces require disciplined young men not gabroo jawans looking for fights and before you try to justify your response in light of F.O.X's post keep in mind that:
1. In the Armed Forces, you will be constantly bullshitted by every senior for no reason whatsoever for much of your early career.
2. F.O.X's concern was genuine because the set criteria is and has been that hopefuls for the SSG have to be serving members of one of the armed forces already. There is no scheme for latent entry, unless they just outed one now.