Captain America's shield

Captain America uses his shield as a primary defensive and offensive piece of equipment for battle. His shield is made out of Vibranium.

Captain America: The First Avenger
Steve Rogers uses an ornamental version of the triangular shield during a musical tour promoting War Bonds, which he then uses in his first field mission. Rogers later acquires the familiar circular shield from Howard Stark. Rogers chooses the unadorned vibranium shield (actually a prototype) over several more advanced models based on the triangular shield. The Vibranium prototype shield proved to be the perfect weapon for Steve. As Captain America he accomplished amazing feats with it. Aside from bashing HYDRA soldiers and blocking incoming attacks, Rogers was able to throw it with near perfect aim and have it ricochet back to him. It is frozen along with the Captain when he sinks Johann Schmidt's plane on the Arctic.

"Valediction"
When Dr. Fenhoff hypnotize Howard Stark, taking him back to the time that holds his greatest shame. Howard see himself on an icy tundra, with a pilot telling him he thinks they found The Valkyrie. He then sees Peggy Carter holding Captain America's shield, asking him to bring Steve home.

Iron Man
A prototype of Captain America’s shield can be seen in the workshop when Pepper Potts walks in on Tony trying to get out of his damaged armor; the shield is visible in the distance below Tony's right arm. Tony subsequently used the alloy of a prototype to create his armor.

The Incredible Hulk
A deleted scene features the shield covered by snow.

Iron Man 2
Phil Coulson finds a prototype replica of Captain America's shield in Tony's house.

The Avengers
Captain America's shield proved most effective in his confrontation with Thor as it absorbed the full impact from Mjolnir and caused a massive shock-wave to the surrounding forrest area. Steve uses the shield again in the battle with the Chitauri in New York to shield his teammates as well himself. Iron Man's Repulsors rays reflect off of Cap's shield to launch an effective counter strike attack on Chitauri unit. Cap uses his shield to catapult Black Widow onto an approaching Chitauri aerial platform. Cap then proceeded to uses the shield to protect himself from a grenade blast that sends him hurtling out a window and to the street below unto the car roof. Because of the Shield structure Cap was able to curl himself and protect himself from receiving extensive injuries.

Captain America: The Winter Soldier
After the Battle of New York, Steve supremely honed his shield fighting skills. Steve learned to use his shield in new, modern fighting styles. Steve almost single handedly took down an entire squad of pirates led by Georges Batroc, on board the Lemurian Star. The shield allowed Steve to survive a jump from forty stories up in the Triskelion and land in the main hall. Steve was able to use his shield in bringing down an armed Quinjet. Steve used his shield to damage The Winter Soldier's bionic arm when they fought each other in a brutal one-on-one fight. When onboard the Helicarrier Steve refused to fight Bucky, ditching his shield, and letting it fall into the water below. It is retrieved and laid by Steve's bedside while he recovered in the hospital.

Avengers: Age of Ultron
Tony Stark retrofits Captain America's shield to make it more efficient and effective in battle by giving it the ability to be called back, much like the Iron Man suits. No longer equipped with two handles in the back, the shield now has a magnetic element that clips onto Cap’s gauntlet.

Appearances

 * Marvel Cinematic Universe (4 films)
 * Captain America: The First Avenger (First appearance)
 * The Avengers
 * Captain America: The Winter Soldier
 * Avengers: Age of Ultron
 * Marvel Cinematic Universe (2 TV series)
 * Agents of S.H.I.E.L.D.
 * "Pilot" (Recycled footage)
 * "The Only Light in the Darkness" (Mentioned only)
 * Agent Carter
 * "Valediction"

Trivia

 * In the comics, the shield is created by Dr. Myron MacLain with both vibranium and "proto-adamantium".
 * In Captain America: The First Avenger, both Bucky and Falsworth wield the shield in addition to Steve. Bucky during his last stand on Zola's train, and Falsworth throws the shield to Steve in the final battle. In the comics, Barnes was Steve's successor as Captain America and Falsworth was the UK equivalent, Union Jack.
 * In Iron Man 3 and Marvel One-Shot: All Hail the King, the fake terrorist Trevor Slattery has a tattoo of Captain America's shield on the back of his neck, except with the star replaced by an A for anarchy.
 * In Captain America: The Winter Soldier, Whilst battling the Winter Soldier, Captain America needs all the resources he can get, including his iconic shield, which has a lot more uses in the film. The shield is traditionally used mostly as a defensive weapon, but in Captain America: The Winter Soldier the filmmakers wanted to explore using it more as an offensive weapon. There are two handles on the shield and Steve Rogers can hold onto the handles in order to utilize it in an eastern style of fighting.
 * In Avengers: Age of Ultron, Captain America's shield receives Stark tech enhancements with sub-miniature transistors which allow Cap to recall his shield wearing a magnetized arm gauntlet as a homage to the same enhancements gifted to Steve Rogers from Tony Stark in the Avengers #6 comic.
 * In the comics, Molecule Man, Doctor Doom, Thanos, Thor and Seapent broke Captain America's shield.