With regard to the external fuel tanks. The 450 gallon external tanks on the "A" are gone.
Most of the info below was gleaned from the references posted earlier in this thread.
The 450's being gone did not last, the were recycled and added to some of the Js:
https://www.military.com/equipment/kc-130j-herculeshttp://rpdefense.over-blog.com/2015/03/ ... grade.html
https://www.airforce-technology.com/new ... ght-tests/
The weather planes carry 1400 gallon externals not 450 gallon.
An average weather reconnaissance mission might last 11 hours and cover almost 3,500 miles while the crew collects and reports weather data. The WC-130J carries a minimal crew of five: pilot, co-pilot, navigator, aerial reconnaissance weather officer and weather reconnaissance loadmaster.
The aircraft is equipped with two external 1,400 gallon (5,320-liter) fuel tanks and an internal 1,800 gallon (6,480 liter) fuel tank.
The Aussie birds carry modified "H" model 1800 gal external not 450 gallon. Howmnthey are modified I don't knolw.
The external fuel tanks used in the current trial have been upgraded and modified from remaining stock after the retirement of the C-130H Hercules aircraft in 2012.