Originally posted by LazerLordz:
Our population base is not big enough for us to exclusively use Commissioned Officers in junior command roles.Further more, our NCOs undergo their advanced specialisation training at the SSG level, therefore by the time they are eligible for the 2WO rank(remember not all WOs are Regimental Sergeant Majors), they will go for their WO course, which includes IIRC, lessons on platoon leadership etc.
Each vocational WO has his or her own skill in addition to this junior leadership course taught to them, therefore we can utilise them as both SMEs and OCs when there is a shortage of Commissioned Officers.
Simply put, our WOs gain their rank by progression , not a technical specialisation.

FYI, I happen to be a junior Specialist, 3SG.In the US Army, theoretically I may be able to apply to be a WO.But in the SAF, if I'm a regular, I'll have to progress up the ranks.
http://www.mindef.gov.sg/arc/specialist/spe_2500.htmlSee here for more info on how our Specialist Corps and WOs advance.
Thanks for the information (and apologies for editing whilst you were posting!).
The Army has just released new definitions of US Warrants. I've added these below.
US Army Warrant officer definitionsThe Army WO is a self–aware and adaptive technical expert, combat leader, trainer, and advisor. Through progressive levels of expertise in assignments, training, and education, the WO administers, manages, maintains, operates, and integrates Army systems and equipment across the full spectrum of Army operations. Warrant Officers are innovative integrators of emerging technologies, dynamic teachers, confident warfighters, and developers of specialized teams of soldiers. They support a wide range of Army missions throughout their career. Warrant officers in the Army are accessed with specific levels of technical ability. They refine their technical expertise and develop their leadership and management skills through tiered progressive assignment and education. The following are specific characteristics and responsibilities of the separate, successive WO grades.
a.
Warrant officer one. An officer appointed by warrant with the requisite authority pursuant to assignment level and position given by the Secretary of the Army. WO1s are basic level, technically and tactically focused officers who perform the primary duties of technical leader, trainer, operator, manager, maintainer, sustainer, and advisor. They also perform any other branch-related duties assigned to them. They also provide direction, guidance, resources, assistance, and supervision necessary for subordinates to perform their duties. WO1s have specific responsibility for accomplishing the missions and tasks assigned to them and, if assigned as a commander, the collective or organizational responsibility for how well their command performs its mission. WO1s primarily support levels of operations from team or detachment through battalion, requiring interaction with all soldier cohorts and primary staff. They provide leader development, mentorship, and counsel to enlisted soldiers and NCOs.
b.
Chief warrant officer two. CW2s are commissioned officers with the requisite authority pursuant to assignment level and position as given by the President of the U.S.. CW2s are intermediate level technical and tactical experts who perform the primary duties of technical leader, trainer, operator, manager, maintainer, sustainer, and advisor. They also perform any other branch-related duties assigned to them. They provide direction, guidance, resources, assistance, and supervision necessary for subordinates to perform their duties. They have specific responsibility for accomplishing the missions and tasks assigned to them and, if assigned as a commander, the collective or organizational responsibility for how well their command performs its mission. CW2s primarily support levels of operations from team or detachment through battalion, requiring interaction with all soldier cohorts and primary staff. They provide leader development, mentorship, advice, and counsel to NCOs, other WOs and company-grade branch officers.
c.
Chief warrant officer three. CW3s are commissioned officers with the requisite authority pursuant to assignment level and position as given by the President of the U.S.. CW3s are advanced-level technical and tactical experts who perform the primary duties of technical leader, trainer, operator, manager, maintainer, sustainer, integrator, and advisor. They also perform any other branch-related duties assigned to them. They provide direction, guidance, resources, assistance, and supervision necessary for subordinates to perform their duties. CW3s have specific responsibility for accomplishing the missions and tasks assigned to them and, if assigned as a commander, the collective or organizational responsibility for how well their command performs its mission. CW3s primarily support levels of operations from team or detachment through brigade, requiring interaction with all soldier cohorts and primary staff. They provide leader development, mentorship, advice, and counsel to NCOs, other WOs and branch officers. CW3s advise commanders on WO issues.
d.
Chief warrant officer four. CW4s are commissioned officers with the requisite authority pursuant to assignment level and position as given by the President of the U.S.. CW4s are senior-level technical and tactical experts who perform the primary duties of technical leader, manager, maintainer, sustainer, integrator and advisor. They also perform any other branch-related duties assigned to them. They provide direction, guidance, resources, assistance, and supervision necessary for subordinates to perform their duties. CW4s have specific responsibility for accomplishing the missions and tasks assigned to them and, if assigned as a commander, the collective or organizational responsibility for how well their command performs its mission. They primarily support battalion, brigade, division, corps, and echelons above corps operations. They must interact with NCOs, other officers, primary staff, and special staff. CW4s primarily provide leader development, mentorship, advice, and counsel to NCOs, other WOs and branch officers. They have special mentorship responsibilities for other WOs and provide essential advice to commanders on WO issues.
e.
Chief warrant officer five. CW5s are commissioned officers with the requisite authority pursuant to assignment level and position as given by the President of the U.S.. CW5s are master-level technical and tactical experts who perform the primary duties of technical leader, manager, integrator, advisor, or any other particular duty prescribed by branch. They provide direction, guidance, resources, assistance, and supervision necessary for subordinates to perform their duties. CW5s have specific responsibility for accomplishing the missions and tasks assigned to them. CW5s primarily support brigade, division, corps, echelons above corps, and major command operations. They must interact with NCOs, other officers, primary staff and special staff. They provide leader development, mentorship, advice, and counsel to WOs and branch officers. CW5s have special WO leadership and representation responsibilities within their respective commands. They provide essential advice to commanders on WO issues."