The Four Fans of Freedom.
"Go mechanical on number 4!".
Nobody needs a standby horizon in a military C-130 until all electrical systems fail in IMC....TWICE for one Aircraft Commander (my father), in an 'A' and then an 'E' model. All those legs in F-51s, RF-84Fs, Connies, C-119s, KC-97s, C-124s (only 100 hours on one trip to Saigon and back...at 11,000') and C-130s/B-727s paid off.
But the highly-experienced, professional (enlisted) Flight Engineers saved their lives, with electrical emergencies which were not supposed to happen-all systems normal until then. This was not like the Zantop 'Logair' Electra over Utah.
The first action on the later incident C-130 was to quickly point a flashlight at the unpowered AC's horizon/ADI (no inverter power...) as they used all their knowledge climbing from Scott AFB at 500' AGL in the weather at night!
The third desperate crew (C-130B?) over Hawaii threw down the landing gear to try to slow down before they went below the undercast and had a visible horizon.
In solid IMC that crew would have died.