. >> logan: colonel kurt crytzer, a veteran green beret of 23 years, flew with us over the seemingly endless jungle, where the area they're searching is as big as texas. he took command of the u.s. special operations mission here not long after president obama decided to send troops 18 months ago to track down the world's most wanted warlord. >> crytzer: the environment is some of the most unforgiving on planet earth. when you get to the jungle, 50 feet in, you disappear. >> logan: you're like a ghost. >> crytzer: you're like a ghost. >> stahl: could you show us the difference between the fastball and the knuckleball, what the motion looks like? >> dickey: yeah, sure. be glad to. >> stahl: this is the fastball. see how it spins all the way to the catcher's mitt? now, watch the near-total absence of spin in r.a. dickey's knuckleball. from the time the ball leaves his hand, it rotates a mere quarter of one revolution. it's a pitch that's devilishly hard to control and won him the cy young award last season. >> ♪ blue texas skies keep shining down on me. ♪ >> safer: out on the lone prai

. >> logan: colonel kurt crytzer, a veteran green beret of 23 years, flew with us over the seeminglyndless jungle, where the area they're searching is as big as texas. he took command of the u.s. special operations mission here not long after president obama decided to send troops 18 months ago to track down the world's most wanted warlord. >> crytzer: the environment is some of the most unforgiving on planet earth. when you get to the jungle, 50 feet in, you disappear. >> logan: you're like a ghost. >> crytzer: you're like a ghost.

. >> reporter: colonel kurt crytzer flew with us over the seemingly endless jungle where the area they'ree u.s. special operations mission here not long after president obama decided to send in troops 18 months ago. >> the environment is some of the most unforgiving on planet earth. when you get to the jungle, 50 feet in, you disappear. >> reporter: you're like a ghost. >> you're like a ghost. >> reporter: recently the ugandans and the americans temporarily suspended their hunt in the central african republic because of political unrest. but not before ugandan soldiers killed kony's chief bodyguard close to where we filmed them. >> so lara, the question is, one, why is this in the u.s. national interest? and two, the special ops forces are the best force we have for this kind of mission. why is it so difficult? >> well, good questions, charlie. and the u.s. is involved in this because the ugandans are a critical partner in the war against terror. and with the rise of extremism and terrorist networks across africa, the ugandans are in the lead in that fight in somalia and other places. so