Monroe had augmented strength and reflexes superior to that of any Olympic athlete.
Monroe has extensive experience in hand-to-hand combat, having received personal tutoring by Captain America. Soon after awakening in the modern age, Steve Rogers met Rick Jones.
At one point during his solo career, Monroe was injured severely enough to need to be placed in stasis once again.
He was revived and brainwashed by Henry Peter Gyrich (who was in turn being manipulated by Baron Strucker).
The use of Barnes' EMP is shown when Barnes uses it to shut down a Nick Fury LMD and when he attempts to use it on Iron Man.
The arm has a holographic function to disguise it as a flesh and blood arm.
As Captain America, he possesses the original, indestructible, vibranium alloy shield used by his predecessor, as well as a Kevlar/Nomex blend, shock-absorbing costume.
He often carries several conventional weapons such as knives, guns - mostly a Colt 1911-A1 .45 and a P08 Luger - and grenades.
He also used throwing knives on occasion and was a gifted advance scout.
His time as the covert Soviet agent known as the Winter Soldier helped to further hone his skills, making him the equal to his predecessor in combat skills, and an expert assassin and spy.
Monroe was starting to have delusions again, and started hallucinating; his sanity was again destabilizing, as it had when he first became Bucky.
In the same story, Jack Monroe was shot by the Winter Soldier (James Buchanan Barnes, the original Bucky) and dumped in the trunk of a car.
By the middle of 1954 they were irrationally attacking anyone they perceived to be a Communist.