Etymology
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Wehrmacht (n.)

"the armed forces of Germany," 1935, from German Wehrmacht (name of the armed forces 1921-1945), from Wehr "defense" (from PIE root *wer- (4) "to cover") + Macht "might" (from PIE root *magh- "to be able, have power").

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*wer- (4)

Proto-Indo-European root meaning "to cover."

It forms all or part of: aperitif; apertive; aperture; barbican; cover; covert; curfew; discover; garage; garment; garnish; garret; garrison; guarantee; guaranty; kerchief; landwehr; operculum; overt; overture; pert; warn; warrant; warrantee; warranty; warren; wat; Wehrmacht; weir.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit vatah "enclosure," vrnoti "covers, wraps, shuts;" Lithuanian užveriu, užverti "to shut, to close;" Old Persian *pari-varaka "protective;" Latin (op)erire "to cover," (ap)erire "open, uncover" (with ap- "off, away"); Old Church Slavonic vora "sealed, closed," vreti "shut;" Old Irish feronn "field," properly "enclosed land;" Old English wer "dam, fence, enclosure," German Wehr "defense, protection," Gothic warjan "to defend, protect."

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Luftwaffe 
air arm of the German Wehrmacht in the World War II era, 1935, from German Luftwaffe, literally "air-weapon," from Luft (see loft (n.)) + Waffe (see weapon (n.)).
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