I would have to be the architect to know the reasons behind the choices of Internet's design. But I would also believe it if the architect was a very close friend of mine and they admitted that they had absolutely no intention to create the Internet in a way that it would remain operational at times of war. I would also want to hear a similar confession from a person who allowed funding to the project and every key participant who knew about it and who had the power to change the course of things. It could very well be that the project was not cancelled only because it had military implications that no one officially talked about. The reasons for such secrecy typically include budget problems. For example, funding policy may require from the project to have solely civilian utility, so any references to military uses may get it cancelled. Just because no one officially talked about the military implications of the Internet does not mean there were none. Especially when the military implications are so damn obvious.