Every district has a "Sainik Kalyan Kendra." You can approach this center to put up your notice. They operate their own employment exchange for ex-servicemen. They may circulate this information to those in need.
In Bangalore, we have a Sainik Kalyan Kendra at Kariappa Bhavan, located at the intersection of Residency Road and Brigade Road.
Unsolicited Suggestion
While it's commendable to target defense personnel, their ability to excel in sales remains to be seen. Selling requires persuasiveness, which may take time to develop for individuals from a defense background who tend to be straightforward. This is why many defense personnel often work in administrative roles, security, etc. Having a defense background myself, I understand this perspective and offer these comments.
Regards,
Dinesh V Divekar