While HIV vaccine research is an exciting field, it's worth pointing out that halting HIV transmission is, practically speaking, a solved problem with oral and injectable reverse transcriptase inhibitors. The ongoing loss of life and health due to HIV could be stopped if we cared enough to invest resources in wide-scale PrEP availability and public health education. Waiting for an HIV vaccine is the domain equivalent…
Also, even if it were a solved problem, the methodologies developed here can probably help with other viruses too in the future. This has already happened with the antivirals originally developed for HIV.