USS Abraham Lincoln, one of America's Nimitz class supercarriers commissioned in 1989, recently completed a multi-year mid-life Refueling and Complex Overhaul that began in 2013. In May of 2017, she was redelivered to the fleet and is slated to make its first operational deployment since its refitting. During her downtime, the nuclear-powered carrier received many upgrades, some of which are very visible when viewing the ship externally. Below is a comparison shot of the USS Abraham Lincoln's island from before the overhaul and after . The changes are quite dramatic. An entirely new mast has been fitted as well as a new radar tower design located just behind the island superstructure. Also, what's clear is how the carrier's satellite communications suite has been totally reconfigured and expanded. Satcom domes cover not just the island but also the radar tower. One of the ship's AN/SLQ-32 SEWIP electronic warfare systems has been relocated from the upper section on the island, down to just below the deck-line. Finally, what's also immediately clear is that the number of radar target illuminators used to guide RIM-7 Sea Sparrow and RIM-162 Evolved Sea Sparrow Missiles (ESSMs) have been reduced by two and the remaining two have been repositioned. The three previously mounted atop the island have been reduced to just one, which is now positioned at the forward right corner on the island. The one that was on the radar tower still remains, but it has been moved up a bit on the new tower. The reduction in illuminators could be because of the fact that the new Block II variant of the ESSM is active homing capable and networked. As a result, it doesn't have to rely on illuminators to home in on its target. You can read all about this system in this past article of ours.