I know that article very well and your memory is inaccurate, in all of those wars the Marines drafted GIs to serve, it is the Navy that has almost always depended on volunteers, except for WWII. The Navy and (post Army) Air Force do fine, but the Marines and Army have to use a draft when the needs are great.
I don't know about the Sununus, but in their 172 years here nothing has gotten a male in Mitt Romney's direct line, into the military, not a draft, nor enlistment, nothing, but the Bushes have a pretty good history George W. served and Jeb's son served in Afghanistan for 8 months.
Jeb’s son did a quickie tour all for show. Webb, McCain, Hunter...those families sent sons into combat.