At least one deeply informed and militarily experienced observer, Col (Rtd) Patrick Lang, sees the current crisis in Iraq as potentially akin to South Vietnam in 1975.
Armies are social groups that have weapons. They are not collections of equipment. The ARVN [Army of the Republic of Viet Nam] was much more numerous than the NVA [ North Vietnamese Army] in 1975. They were also much more heavily equipped and had been trained intensively for years. Some of their formations like the 1st ARVN Infantry Division had been well thought of and had previously fought well but in 1975 that division fell completely to pieces against smaller NVA forces. As I have said, the Iraqi Army must now mount a successful counter-offensive or the Maliki government is doomed.