Excellent APP, uninstall and reinstall new version!
I love this App, but must say that the complication on the watch was not updating. I read the developer’s response to a user comment about the same. I decided to uninstall the app on my iPhone which uninstalled it form the watch, and then subsequently reinstalled. This fixed the problem. The complication now always show the current Zulu time without having to tap it. Hope this helps someone!