HI everyone i8 was searching about this and I found very useful information about ths. And I would like to share that with you for Maximizing utility of new decorations in Empire and Allies, Don't worry with the decorations as they exist today. It's too much work and/or EP, and you don't even make as much as if you simply replaced the decoration through a working facility (oil well, mine, whatever). It probably doesn't make sense for most people who would like to reduce military costs, either. Figure that the best-case discount is through surrounding a single military facility through 8 refineries that you have to carry on staffed. That would result in a discount of 80% for a single facility. It would have cost you 240 EP for that discount. The most expensive unit you'd build uses 100,000 coins - 75,000 if you've researched it already. So you might save 60-80,000 coins every 18-24 hours and you'll have used a whole 3x3 grid to do so (as well as 240 EP).