Basically, because of contracts and support infrastructure on the equipment. For every major equipment system, their exists an immense support network of tenured Government Service employees who would have to kill someone to lose their jobsā¦so, it just ends up being easier to support the old equipment than to replace it with something new.
I will tell you of one of my experiences early in my career just to give you an idea of the kind of madness this is. I needed to replace an electrical compressor motor. Within the government supply system, the item had a list price of $8,000. I thought to myself that price seemed insane. So, I looked up the manufacturer of the motor and contacted them directlyā¦their price was only $800!!! I said, āIāll take two!ā So, here I am thinking that I did a great thing for my country by saving thousands of dollars and feeling very proud of myself. Well, a couple weeks later, the supply officer wanted to know why I purchased a part via commercial means when the part was available through government supply system. I told him because it was cheaper! So, I got a lecture on how these things are contracted and next time use the contract first.
Despite this insanity, people canāt seem to figure out why our nation is on the verge of bankruptcy!