While our military is better armed it is not armed to fight a revolution, and it certainly is not prepared for such an event. Additionally our military is also much more tolerant of differing political view points, so it is very likely that the military its self would fracture in the event of a real revolution or simply refuse to take violent action against non-violent revolution.
Even if you could count on the military staying 100% loyal to the old administration they wouldn't be very difficult to take down by popular action. I've only ever been on one military installation that appeared to have any semblance of defensibility, and that was because it was on an island. Most installations have basic fences on very large perimiters with no defensive works what so ever and armories usually only have enough small arms for the resident MP's and training at the range. Most of the troops also live off base and there wouldn't be room on the installation for them and their families if they had to bring them inside the perimeter.
While we have a rather large standing military most of the troops are not really trained for combat. The current civilian population easily contains more than 10 times as many veterans. The civilian population in the US is also considerably better armed than the populations in many of those countries you are referring to. The kind of armaments that the civilians don't have they likely would not need, you only need tanks if you want to take heavily fortified positions and there just aren't many of those in the US.