According to Wikipedia: "The raid was carried out by approximately two dozen heliborne U.S. Navy SEALs from the Red Squadron of the Joint Special Operations Command's U.S. Naval Special Warfare Development Group (DEVGRU). For legal reasons (namely that the U.S. was not at war with Pakistan), the military personnel assigned to the mission were temporarily transferred to the control of the civilian Central Intelligence Agency.The DEVGRU SEALs operated in two teams and were reportedly equipped with Heckler & Koch HK416 military assault rifles, Mark 48 machine guns used for fire support, FN SCAR-H STD Mk 17 battle rifles and H&K MP7A1 personal defense weapons (with attached Knight's Armament QDSS-NT4 suppressors), Insight Tech. AN/AVS-6 and GPVNG-18 (Ground Panoramic Night Vision Goggles) L-3 night-vision goggles, body armor and sidearms such as SIG-Sauer P226R Navy MK25 and H&K Mark 23 Mod 0.
According to The New York Times, a total of "79 commandos and a dog" were involved in the raid. The military working dog was a Belgian Malinois named Cairo. According to one report, the dog was tasked with tracking "anyone who tried to escape and to alert SEALs to any approaching Pakistani security forces". The dog was to be used to help deter any Pakistani ground response to the raid and to help look for any hidden rooms or hidden doors in the compound. Additional personnel on the mission included a language interpreter, the dog handler, helicopter pilots, "tactical signals, intelligence collectors, and navigators using highly classified hyperspectral imagers".
The SEALs flew into Pakistan from a staging base in the city of Jalalabad in eastern Afghanistan after originating at Bagram Air Base in northeastern Afghanistan. The 160th Special Operations Aviation Regiment (SOAR), a U.S. Army Special Operations Command unit known as the "Night Stalkers", provided the two modified Black Hawk helicopters that were used for the raid itself, as well as the much larger Chinook heavy-lift helicopters that were employed as backups."