I mean Long Range Survelliance Detachment. The are similar the SF but they do not have direct action mission. It is really hard to get in there since they choose their own members. The ones I was thinking of are the ones attached to the 101 Abn (311 MI Batt LRSD).
Eviscerator, yes it is true that they are rangers. You have to have gone to ranger school and airborne school to be able to to get in LRSD.
And yes it is also true that they carry more equipment then a normal ranger (reason being that they stay a pretty long time in the field, sometimes 4-5 weeks). A normal ammo loadout for a lurp is 17 mags + full reload, 3 claymores and one LAW (yes they do still use them) some also carry extra ammo for the MGs or the 203s. They are also known to use the tiger stripe uniform sometimes.