Anecdotally, scientifically, rhetorically, every population centre where homelessness exists, you'll find veterans amongst them. To get back to the size issue, there's no single authoritative source of measurement on the quantity of homelessness other than the fact that it exists. It's a very transient population. There's no single or monolithic description for it. It's all ages, all genders, all walks of life.
On March 27th, 2018. See this statement in context.