Shyguys are enemies in the Super Mario Bros. series of games. Alongside Goombas, Piranha plants and Koopa Troopas, they are the most common enemies in the Mario series.

The Shyguy began as an enemy in a Japanese game titled Doki Doki Panic. This game never made it to the U.S. in its original form, but was transformed into Super Mario Bros. 2. Most of the enemies in the game were from the Japanese version, which included Bob-ombs, Snifits, and Shyguys. These characters are now instantly recognizable as Mario's enemies, even though they were intended for an entirely different environment. Lately, they've taken refuge in such locales as Yoshi's Island and Shy Guy's Toy Box.

Shyguys, as the name suggests, are very shy. They always have masks covering their faces, the only parts not covered are the eyes and mouth. Shyguys can wear different colors, such as red, blue, green, yellow or purple. Their attacks usually consist of simply running into the hero, although some use slingshots. Some varieties, like Snifits and Snufits spit projectiles like the Octorok, while others may catch fire, such as Pyro-guy. They have also come up with some very peculiar inventions over the years, such as walking on stilts, bouncing on pogo-sticks, and piloting submarines. In the Yoshi's Island game, Shyguys could be turned into eggs by Yoshi and it was common for Shyguys to pop out of pipes until Yoshi couldn't make any more eggs.

In Paper Mario (N64), the Shy Guys played an essential role in one of the chapters; the boss (General Guy) at the end of Shy Guy's Toy Box had imprisoned a Star Spirit. In the Toy Box, several varieties of the Shy Guys are found, including red, blue, yellow, and green Shy Guys, as well as Medi Guys, Pyro Guys, Balloon Guys, Camo Guys, the Gourmet Guy, and the Anti Guy. General Guy hid in a tank and sent his minions after Mario: a group of 15 Shy Guys, 2 Shy Stacks (4 Shy Guys standing on top of each other), and 2 Stilt Guys. The party member Watt played an essential role in defeating General Guy. In Paper Mario: The Thousand-Year Door, Shy Guys play more of a helpful...or neutral role towards Mario. They will sometimes sit in the audience and help Mario or his opponent in battle by messing with the stage. In this sequel, the only enemy Shy Guys are Bandits, Big Bandits, and Badge Bandits. As their names imply, they will steal things from you - the Bandits steal coins, the Big Bandits steal items, and the Badge Bandits steal badges (naturally).

Air cavalry are infantry units that use air units like the helicopter for mobility and firepower.

Air mobility has been a key major concept since World War II. Paratroopers were dropped from the skies at Sicily, Normandy, Holland and Crete. Meanwhile, the Germans were using the autogyro to airlift downed Luftwaffe pilots back to friendly lines. As the war ended, the Allies, the Americans in particular, saw that having a vertical take off and landing craft may be useful. During the Korean War, the U.S. had their first combat test of the helicopter. It was unofficially called the "Flying Banana" because of its banana-like appearance. But, with the limited action it saw, Air mobile was born.

The need for a new type of unit became apparent to the US Army in 1964 when they saw a new kind of war heading their way. The Army saw that Vietnam is varied in terrain, having jungles, mountains, and rivers, making maneuvering very difficult. To circumvent this problem, they developed the idea to use helicopters to leap in and out of battles, carry out the wounded, and drop off supplies.

However, the Army realized that it would take a new revolutionary combat leader to command this new outfit. They called on Colonel Harold G. Moore, an old army paratrooper, to be its commander. The unit was designated the Seventh Cavalry, the same regiment that Custer had commanded at the Battle of the Little Bighorn. On November 14, 1965, he led his troops in the first major engagement of the Vietnam War, which took place near the Chu Pong massif near the Vietnam-Cambodia border. It is known today as the Battle of the Ia Drang Valley. For three grueling days, 400 Americans and 2000 NVA fought it out on a ground no bigger than a football field. The Seventh Cavalry were victorious. Thus started the long and proud history of the Air Cavalry, which has continued with the formation of new Air Cavalry units and is developing the idea of having an attached Medi-Vac group, as well as a small battery of artillery (105mm howitzers) that would be used as support. Like Infantry units, the Air Cavalry also has a platoon or two of mortars for close support.