I'm part of a service couple, so until someone comes by with greater experience, I'll leave my piece as a place marker. This is all my experience, and as such, is fairly limited. Take everything I say as one individual's opinion and balance it against the opinions of others.
Clubs, associations, centres, and the like provided by or for Forces' spouses seem to me to be wife oriented. When I deployed or was on training, she was approached by the organisations offering her welcome and membership despite our never having lived on base. I was never given that option, but nor did I pursue it. It was never really that appealing to me; I instead chose to pursue non-military organisations and pursuits. The MFRC I generally ignored but can't really rationalize why. If he's working somewhere, he'll also be able to get much needed social interaction when you're deployed. Through the wonders of the Internet, I am able to maintain close contact with friends from across Canada.
Because I'm a service member, I understand what is required of my wife while deployed. Owing to her MOC, I know she can't talk to me about pretty much all of her work and training. As an owner of the C1A1 Male Ego, it is difficult for me to be out of the loop, but I soldier on. I have a group of military and non-military friends & family to use as a social/support network, but I must admit, I am uncomfortable joining a predominantly female spousal organisation (it's not sexism, just misogyny).
Depending on your location, there's bound to be something for him. This may involve joining a gentleman's sports league (read drinking club for the athletically challenged), Toastmasters, the Moose Club, the Masons... whatever. While you're away on training awaiting the move, there's nothing stopping him from trying a few clubs and associations while he's still at home. Large clubs tend to attract similar-minded individuals, so transitioning between chapters might be easier for him. Our current posting requires me to drive to Toronto or Ottawa for an association meeting should I choose to attend, but I was a member at my previous posting and found similar people at the new location. Through this site, I've been able to learn of other nonmilitary organisations at my posting that are very interesting and very similar to ones I was involved with previously.
