Meh. Spiking the guns and moving out in an orderly withdrawal of the embassy is nothing I'll get worked up about. Handguns and rifles are expendable. They were not retreating nor surrendering.
The MSG force is not a combatant unit. The guys doing the real work in country are still around, and still have their boomsticks.
I completely disagree with your assessment. This was a purely political decision that was completely unnecessary. It sends the worst message that could be sent to our enemies. They already know that we will lay down and give up our embassies and facilities if it comes to a firefight. Benghazi proved it and this is more of the same Quisling politics.
This may be SOP for today, but it wasn't when we had real men leading this country. Now we have complete ineptitude on an epic scale. People like Obama, Susan Rice and Jen Psaki are wholly unqualified to be making these decisions. I'm ashamed for those Marines and all that have come before them (including me).
P.S., MSG units in hostile territory are absolutely combat units. This isn't the Army we're talking about here.