The Hamburger Hill of Art / Single Minded Stakeout!
The Hamburger Hill of Art: During a field trip to the park, the class selects Sousuke to be the model for their art project. However, Sousuke misinterprets the modeling advice he receives from their art teacher, turning the assignment with his classmates into a game of life-and-death. Single-Minded Stakeout!: Kaname goes on a date with a former classmate to an amusmement park while Sousuke and Kyoko follow her. Sousuke seems relieved that she's simply on a date until drunken yakuza threaten Kaname. Not wanting to reveal that he was following her, Sousuke comes to the rescue disguised as a park mascot.
Aired 09/09/2003EP 3 - The Hamburger Hill of Art / Single Minded Stakeout!

Full Metal Panic? Fumoffu
It's back-to-school mayhem with Kaname Chidori and her war-freak classmate Sousuke Sagara as they encounter more misadventures in and out of Jindai High School. But when Kaname gets into some serious trouble, Sousuke takes the guise of Bonta-kun - the gun-wielding, butt-kicking mascot. And while he struggles to continue living as a normal teenager, Sousuke also has to deal with protecting his superior officer Teletha Testarossa, who has decided to take a vacation from Mithril and spend a couple of weeks as his and Kaname's classmate.
(Source: Anime News Network)