The amendment passed, but not before delegates from Texas, Louisiana and other caucus states led an effort to render it non-binding. I’ve posted the amendment below, with the original language in strikethrough, so you can see what they did:

Any process authorized or implemented by a state party for selecting delegates and alternate delegates or for binding the presidential preference of such delegates shall may use every means practicable, in the sole discretion of the state party, to allow encourage active military personnel the opportunity to exercise their right to vote.

Clearly, this language changes the rule to something more like a recommendation, but a Republican volunteer who lobbied for the original language remained optimistic:

Today, the Convention Rules Committee, by passing this rules change, demonstrated their intent for state Republican parties to make it possible for our men and women in uniform to vote in the presidential selection process. Now, it’s time for state party officials to allow military personnel to vote in primaries and caucuses. We’ll see if they’re willing to back up their pro-military rhetoric with results.

UPDATE: An e-mail:

Steve, I live in TX, and I want a name and address so I can deliver the barrel of tar and bale of feathers personally.

The delegate from Texas who opposed the amendment was Bill Crocker, and instead of sending tar-and-feathers, send him and other state party officials in caucus states an e-mail calling on them to follow the Rules Committee’s recommendation and create a process by which all U.S. military personnel can vote in Republican caucuses.

UPDATE II: See here.