Hello!
Tech structures, you love them, we love them, and we have even more fo you to capture, play with, and enjoy. So, lets not waste time and get into some of the new goodies... 
These radar towers have been erected for observation purposes by local defense forces, but have been abandoned in the wake of recent hostilities. Fortunately, they are still active and can be easily taken by any force wishing to use them in battle, provideing them with a good view of the surrounding area.
Despite advances in alternative fuels and energy sources, petroleum remains a significant proportion of fuels used worldwide. As a result, crude oil remains a fungible commodity and securing petroleum reserves remains a priority for any nation. Many sources of oil remain undeveloped, but can be easily upgraded to pump out crude for refinement and sale on the market. However, should the extraction be performed in a dangerous environment, care should be taken to protect the oil derrick to preserve the investment.
That's all we have for today, till next time generals!
Always suspected but never sure, was the change in oil pumpjack capture mechanic was because of removal of the capture building upgrade to presumably to free up upgrade slots?
either way i do like this system alot more