As an aviator in the US military, I'm not surprised. This is common practice. The system in question is for public domain UK aviation charts and pubs. Many of the unclassified systems I use have the user and password taped to the monitor.
US military unclassified systems are a mess... a spaghetti bowl of disjoint networks, operating systems, hardware, desktop and Internet applications designed by a multitude of lowest bid government contractors with little sense for usability and often very poor technical skills.