If Russia is Selling, the Pentagon Should Keep Buying — Rocket Engines, That Is

One of the more hotly contested defense issues in Congress right now is how to end the U.S. military’s dependence on a Russian-made rocket engine to reach space. But what’s the rush? The U.S. needs these engines and Congress first should make sure a viable alternative is ready. Here’s why.

The military’s use of the RD-180 engine dates to the 1990s…