( ( ( ( ( ( When ( ( the units ) ( are ( ( some ( persons name ) ) ( -LRB- ( ( ( ( usually ( a famous ) ) , ) ( dead scientist ) ) -RRB- ) ) ) ) ) ) ( ( the ( first letter ) ) ( ( ( is generally ) not ) capitalized ) ) ) , ) but ) ( ( the abbreviation ) is ) ) . )
(ROOT (S (S (SBAR (WHADVP (WRB When)) (S (NP (DT the) (NNS units)) (VP (VBP are) (NP (NP (DT some) (NNS persons) (NN name)) (PRN (-LRB- -LRB-) (NP (NP (RB usually) (DT a) (JJ famous)) (, ,) (NP (JJ dead) (NN scientist))) (-RRB- -RRB-)))))) (NP (DT the) (JJ first) (NN letter)) (VP (VBZ is) (ADVP (RB generally)) (RB not) (ADJP (JJ capitalized)))) (, ,) (CC but) (S (NP (DT the) (NN abbreviation)) (VP (VBZ is))) (. .)))
When the units are some persons name (usually a famous, dead scientist) the first letter is generally not capitalized, but the abbreviation is.
(ROOT (S (SBAR (IN If) (S (NP (DT a) (NN unit)) (VP (VBZ is) (VP (VBN named) (PP (IN after) (NP (DT a) (NN person))))))) (NP (PRP it)) (VP (VBZ needs) (S (VP (TO to) (VP (VB be) (VP (VBN capitalized)))))) (. .)))