I did use mods when this first happened, but to test it without any mods i went into the Arma 3 Launcher and unchecked all mods, then started the campaign.
Here is a short video:
http://bestplay.tv/video/54d9ee0a17cc2/arma-iii/surrender
Also found this short discussion
http://steamcommunity.com/app/107410/discussions/0/43099721518786396/
I'm not sure how to check in-game what mods are loaded or show game version (up-to-date in steam).