Only someone doing dangerous and rare types of welding, such as underwater welding, will make a ton of money. The trade-off is that it is extremely dangerous, and life expectancy is well below average.
During IRAQ II I saw a local add (Uk) offering £40K tax free for a basic car mechanic going out to Iraq to presumably work for the Military or PMC
That's against 52K on glassdoor for being a military officer. But I am pretty sure that 52K is taxable itself so the actual different is smaller.
They do seem to make a lot of money.