Being a former terrier from the days when we were volunteering to defend W. Europe from the Russian hordes, I have to say that anyone willing to be in the reserves nowadays and basically be a cheap soldier is being a bit daft.
There are reserve Service-people with more operational service than some regulars. Yet, because reserve service is non-pensionable; if they get slotted, wifie and kids get something like a one-off grand total of @ £14K from MoD to see them through for the rest of their puffs.