From 1961 to 1963, the B-58 was retrofitted with two tandem stub pylons under each wing root, adjacent to the centreline pod, for B43 or B61 nuclear weapons for a total of five nuclear weapons per aircraft. Although the USAF looked at using the B-58 for conventional strikes, it was never equipped for carrying or dropping conventional bombs. A photo reconnaissance pod, the LA-331, was also fielded. Several other specialized pods for ECM or an early cruise missile were considered, but not adopted. The late-1950s High Virgo air-launched ballistic missile was designed to be launched from the B-58; a Hustler carried out four test launches to determine ballistic missile and anti-satellite weapon system capability.