The British kicked bantu ass in Rhodesia, every fight against them was a curbstomp session, the issue was with the foreign governments that got involved, but as we saw with the Arab wars after the presidency of Bush Jr. The US has lost it's ability to fight effectively in wars on foreign soil, only the incompetence of their opposition (trained by their enemy btw) was responsible for their victories, and with time they had only gotten worse, weakening themselves to the point where we could take them out quite effectively, especially given how many of the soldiers would defect to us or work to undermine the efforts of zog against us. If we are cut off from supply lines, we'd not have too much trouble, we prepare for it, grow some food wherever we go, enough to feed the expected population of the area, store the food somewhere safely kept.