Rangel's bill to reinstate the draft is done as a form of protest against the war. He doesn't actually want a draft.
Partly true but this requires elaboration. If memory serves, he had the same shtick back during the gulf war. A large number of minorities, including blacks, join the army, lured by all the recruitment ads that make it appear that the military is a just a place to learn a high-tech skill, get $40,000 for college, and have a good ol' time - never having to be called on to kill the enemy and possibly get killed yourself.
Many democrats like Rangel look on the military as a social service agency for their constituents - which is what it usually functions as, with such amazing circumstances as pregnant women being referred to as "soldiers", plus wholesale "affirmative action" in effect for decades, with such as incompetent women pilots getting pass-throughs so that quotas can be met, likewise with "gender-normed" training standards.
When a war comes along, it disrupts this whole fantasyland model, when the U.S. actually has to fight enemies who may not be impressed with "pregnant soldiers", etc. Rangel's strategy is therefore to oppose every war the U.S. becomes involved in. When the war is prosecuted nonetheless, he attempts to end it with his draft gambit, blowing up the smokescreen that "everybody's kids" should join the fight. This is intended to get middle-class whites to oppose the war, so that the military can return to its "social service" function. The military's actual function is to destroy the enemies of the U.S., and it is a volunteer organization. The people who sucked up all the peacetime goodies, benefits, and perks have no business demanding everyone else join in when they are required to do what they were signed up for - fight wars.