Power Armor: The Dents and the Cracks.
Description:
Power Armor was developed in the recent years before the bombs fell in 2077, and was the peak in personal body armor in the United States Army. The development for power armor started in August 2065 and it's legacy continued even beyond the war in the form of the Enclave, which continued to improve on the latest designs. The plates of power armor were generally made from metal alloys and poly-laminate composite shells, however, the T-45 sets used riveted steel plates. Under the plates sits a large frame, which regulates power and has servos which can be controlled by specific muscle movements that a skilled user performs. Power Armor requires training and extensive use in order to be used effectively, considering that it's movement systems are sensitive and overwhelming if experienced by an ignorant user. The frame allows for increased strength and can even provide movement for amputees (Although fingers and toes cannot be articulated). Power Armor is expensive when regarding the use of power, and requires fusion cores in order to function.
T-45 Power Armor:
T-45 Power Armor was originally developed and manufactured by the U.S Army with the help of Med Tek, it was the first version of power armor ever to be deployed in battle. This version is not as mobile as it's counterparts due to it's less advanced servo designs. It uses riveted steel plates rather than plastic composite materials that suits like the T-51 sets use, and several electronic and mechanical subsystems are exposed. A specialized body suit is required to be worn alongside the frame in order to connect the wearer's movements to the servos and to deal with overheating. The first versions were powered by small energy cells but were soon developed to use the standard issue Fusion Cores. It can handle roughly 2000 joules of impact.
T-51 Power Armor:
T-51 Power Armor was developed in the West Tek Research Facility at the end of the Anchorage Reclamation in January 2077. The outer shell of the power armor is made of a poly-laminate composite, lightweight and capable of absorbing 2500 joules of impact. A 10 micron-thick silver ablative coating allows the power armor to reflect lasers and other radiation emissions without causing damage to the composite surface. The power armor used to utilize a TX-28 Microfusion Pack to power it's systems, but the burden of power was switched to Fusion Cores.
Advanced Power Armor/X-01:
The power armor was created by the Enclave's skilled engineers and scientists after the War. It is composed of lightweight metal alloys which are reinforced with ceramic castings at high stress points. The servos in the armor are generally well-made and it has an auto-gyro system allowing for the frame to be kept upright, even in unconsciousness. This set of power armor can withstand up to 2800 joules of impact.
Advanced Power Armor MKII:
The Advanced Power Armor MKII or X-02 power armor is similar to it's earlier counterpart but is entirely composed of lightweight ceramic composites rather than the usual combination of metal and ceramic plates. Earlier versions had back-mounted power packs similar to the ones found on T-51b suits, however, they were replaced with fusion cores. This set of power armor can handle roughly 2400 joules of impact.
T-60 Power Armor:
The T-60 power armor was developed in early 2077 after the Anchorage Reclamation, it was designed to replace the T-51b power armor as the latest in technology of that field. It incorporates design elements from the T-45 model, having a very similar aesthetic to the previous design. It is very bulky compared to the T-45 set and features composite, double layered, short shoulder plates, along with a lack of exposed machinery and improved servo design. Only a mediocre number of these frames were deployed to domestic U.S army troops before the bombs fell, however, their legacy lives on in the East Coast Brotherhood of Steel. The Brotherhood's increase in power allowed them to scavenge old military bunkers and bases, and this scavenging lead to the discovery of the T-60, which they started to manufacture a few years after. It is slightly superior to the T-51b power armor and has many similarities to the X-01 power armor in terms of function, it can handle up to 2800 joules.