H-1 upgrade program
... that the U.S. Marine Corps H-1 upgrade program is replacing the aging AH-1W SuperCobra and UH-1N Twin Huey helicopters with the AH-1Z Viper and UH-1Y Venom, respectively?
... that the <a href="./United_States_Marine_Corps" id="mwE88" rel="mw:WikiLink" title="United States Marine Corps">U.S. Marine Corps</a> <b id="mwE9A"><a href="./H-1_upgrade_program" id="mwE9E" rel="mw:WikiLink" title="H-1 upgrade program">H-1 upgrade program</a></b> is replacing the aging <a class="mw-redirect" href="./AH-1_SuperCobra" id="mwE9I" rel="mw:WikiLink" title="AH-1 SuperCobra">AH-1W SuperCobra</a> and <a class="mw-redirect" href="./UH-1N_Twin_Huey" id="mwE9M" rel="mw:WikiLink" title="UH-1N Twin Huey">UH-1N Twin Huey</a> helicopters with the <a class="mw-redirect" href="./AH-1Z_Viper" id="mwE9Q" rel="mw:WikiLink" title="AH-1Z Viper">AH-1Z Viper</a> <i id="mwE9U">(pictured)</i> and <a class="mw-redirect" href="./UH-1Y_Venom" id="mwE9Y" rel="mw:WikiLink" title="UH-1Y Venom">UH-1Y Venom</a>, respectively?