I've probably read every Army fatal class A accident report over the last 10 years or so and I can't recall an inordinate number of HMMWV rollovers. I can look in the Army accident database to view every HMMWV rollover accident fatal or non-fatal over the last 25 years or so, but I don't need to. Simply put, considering the incredibly large number of HMMWVs in service and the extraordinary number of miles driven, HMMWVs have an excellent record. Are they perfect? Nope. They absolutely could be safer, but for a variety of very valid reasons they are not. They were not designed primarily as a highway vehicle, nor as an armored combat vehicle, nor as a cargo vehicle, nor as a reconnaissance vehicle, nor as a recreational vehicle, nor as a rock crawler, nor as a mud buggy... They were designed to do everything we could think of, and as it turned out they do a lot of things the designers didn't think of. And the HMMWV continues to do it all passably well. It certainly isn't the best vehicle ever built, but the US military cannot procure a purpose-built vehicle or widget every time someone identifies a requirement. We tried that from about 2005 to 2011 and it isn't even close to sustainable. Remember: Highly Mobile Multipurpose Wheeled Vehicle.