I would say that it would be to offer in-person listening services. It's good to have a 1‑800 line dedicated to suicide prevention, because there can be people at the other end of the line who have been trained. However, I don't know how someone can tell, over the phone, if someone is having suicidal thoughts. I know I can't. The same goes for online chats.
Prevention starts with providing access to a human face. Meetings should be held with teams of veterans, for example. In a phone conversation, the person will always say that everything is fine, because they don't want to start telling their story over the phone.
Meeting in person takes more effort and energy, but, as I said earlier, it saves lives. More than processes, humans will always save lives.