Thank you for the question.
It's not atypical. In fact, it's quite common for departments to lapse money for a variety of reasons: unforeseen events, spending that arrives relatively late in the year, decisions made in less than a timely manner and other factors. There's also an inherent built-in factor that almost forces departments to have a lapse. Departments cannot go above their budgets, so managers tend to be prudent and want to avoid going over their spending authorities.
With respect to defence, I don't think this year will be any different from previous years. We anticipate a lapse of similar magnitude to previous years in this year's Department of National Defence spending.