Rng. Farm it. Ive gotten many from different characters. I farm that and the malok strikes for those helmets. Gotten multiple 335's doing that. I normally solo it but if you have 3 you can close a lobby and just keep dropping strikes til you get one of the 3 that drop strikes. Hunter helmet from malok, warlock helmet from s.a.b.r.e., and titan helmet from alakul all can drop at 335. Infuse what you dont want.